Question about Animator transitions optimization

Hello. I have a one question about animator transitions. Suppose there are 3 State Machines - "A", "B" and "C". I have 2 transitions: first from "A" to "B" and second from "B" to "C" and both transitions have conditions(there is no transition from "A" to "C"). The question is - will the conditions for transition from "B" to "C" be checked if I'm in "A"? Animator checks all transition conditions in same time or not? Thanks.