CL1NT5

Like many, I'm sure, I have been accepted at my second choice and waitlisted at my first. I will likely not find out if I make it off the waitlist until after April 15th but do not want to be left without any other options. Can I accept my second choice and back out of it after April 15th if my first choice pulls through? I only ask because people keep telling me I will need to be release based on criteria of the CGS but the excerpt they are referring to seems to only apply to those that are offered some sort of funding, which is not the case for me.