If it’s the time period, can a team who’s time has expired still go back and make the claim as long as nobody else (including the team on the clock) claims him?

If it’s the secrecy method, can a team claim a few people and cancel the claim if they no longer need that player? For example, if a team is looking for a lead off guy, they claim three people to fill that role. Player A is grabbed by a team with higher priority , the other two fall through (which is why you claim more than just him). Can that team then say we don’t need player C because we were able to get player B, then player C would continue to pass on down the line or all the way through? Or would the team be force to find a place for both players on their 40 man roster?

Man, there are so many details and permutation for the order of events that I can think of. Is there somewhere to read these rules, so I can just lookup the details without overloading questions/posts here (too late?)?