You should ask the seller for all the information you need about the bike, because a) they should know more than we do and b) if they can't give it to you readily then there is more risk that it is stolen. These things do happen!
Don't tell the seller this, but the name is usually written on the frame. If they can't manage that much then consider walking ...
All of those bikes would be fine, at least for a while. You can find pictures of board carriers on all those bikes.
The problem is that salt water destroys bikes. It's why beach cruisers are as cheap and simple as possible, if they actually get used by the ocean they will either require washing or rust out in a year or so.
A Fat bike would be a really ...
It looks like a 2017 Giant Contend SL2 Disc: https://www.giant-bicycles.com/gb/contend-sl-2-disc-2017.
The picture is quite grainy so it's hard to be 100% sure. Check if it has the Giant Conduct disc brake system to be sure.
Here's the image in the linked product page for the 2017 Giant Contend SL2 Disc:
I'd like to expand on the answers offered by @STW and @Mac.
The current rules here ask us not to offer product recommendations (the rules at the time of the original question may have differed). I'm going to focus on what to look for instead of specific products.
I believe the OP had glasses that weren't sport-specific, which Oakley may call ...
FYI I use simple prescription glasses or sunglasses, where the frame is attached to the top of each lens, but not down the sides of the lens nor underneath -- so there isn't a frame at the side of the lens, blocking vision.
Also the arm (between the frame and the ear) isn't thick.
The lenses are long-distance only, not progressive.
Looks like a nice bike - not very old because disk brakes have only been on road bikes in the last ~5 years.
The top tube profile suggests an aluminium frame not carbon fibre, and the thickness of the fork tines/legs suggest they are carbon fibre.
Both tyres are a bit low on air so pump them up before you test-ride it. And you should absolutely test ride ...
Check if they have eyelets for a rack. It is the single most useful thing that can discriminate between them, to understand if they are a good fit to be a commuting bike.
I would then say Scott sub speed 20. With the saved money you can buy a very good lock and some tyres with a grippy thread, but not too wide (if yours has mudguards).
Comfort. That's the single most important measure of a bike and a rider's compatibility.
If you have a bike frame that is too big or small, too long or short, it will exhibit as aches and pains from riding. You won't want to ride a bike that hurts.
How to measure "comfort" ? You as the rider have to get on the bike and try it out. Being younger, you ...
How do I choose a good mountain bike?
Everything on a bicycle is important.
The most important part of a bicycle is the frame.
The best bike for the money will have:
The best quality of frame construction you can afford. Frame quality includes the quality of materials and craftsmanship. Generally, the quality of the components increases as the ...