At the beginning of the turn, does player choose only among the parallelepipeds generated during the last turn, or among all of them, including the previous turns?

For example, K=1, n1=11

First player dissects it at x=2. We have now two parallelepipeds, of size 1 and 9.
Second player chooses the one of size 9, and dissects it at x=3, generating parallelepipeds of size 2 and 6.
Does first player have choice between 1, 2 and 6? Or only 2 and 6?