A two-digit locker combination has two non-zero digits and no two digits are the same. Event A is defined as choosing an even digit for the first number, and event B is defined as choosing an odd digit for the second number. If a combination is picked at random, with each possible locker combination being equally likely, what is P(B|A) expressed in simplest form?

A) 4/9
B) 1/2
C) 5/9
D) 5/8