What do most international CS grad students do in the summer session? (Which housing term to take)

Hey guys! I’m a prospective international CS grad student, who’ll be joining USC’s MSCS program in Fall 17.
I’ve been trying to decide which housing term to take at Troy hall/Troy east (Provided that I even get a spot).

I tried mailing the housing team, and they said that if you select the 12 month agreement (as opposed to the 9 month agreement), you’ll be bound by the contract to stay in the housing accordingly. I was wondering if students are able to get internships in the summer(international students can take up internships under CPT/OPT in the summer right?), and move out of the housing for the same (unless the intern is in LA).

I need to decide which term to select before I can apply for the housing, any help will be greatly appreciated!

PS: As a separate question, could anyone tell me how big the CS graduate batch is?