If logax=b for permissible values of a and x, then identify the statements(s) which can be correct.

a. If a and b are two irrational numbers, then x can be rational
b. If a is rational and b is irrational, then x can be rational
c. If a and b are rational, then x can be rational
d. If a is irrational and b is rational, then x can be rational