The three choices are mutually exclusive, and picking the wrong one is the only way to get an outcome you didn't intend.
Access returns what Dice and its third-party providers hold on you. A cheap first move if you've no idea what a decade-old CV still says, and Dice reports answering these in one to three days.
Opt out of the sale stops the onward selling while leaving your account and CV in place. The right choice if you're still job hunting. Dice reports 152,315 of these in 2024, all granted.
Delete asks for all of your personal information to be removed from Dice's systems and its third-party providers'. Expect it to take your job-seeker account and uploaded CV with it, so choose it when you're done with Dice, not mid-search.
If you want both a copy and a deletion, submit access first, wait for the reply, then submit deletion.