If `(log)_a x=b` for permissible values of `a` and `x ,` then identify the statement(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` is irrational and `b` is rational, then `x` can be rational. (d)if `aa n d b` are rational, then `x` can be rational.