Multiple choice technology web technology Which of the following type specifier is invalid in print f ( ) functions % a % b % c % d Reveal answer Fill a bubble to check yourself A Correct answer Explanation In printf(), %b is for binary, %c for character, %d for decimal integer. %a is not a valid printf type specifier in PHP - valid format specifiers include %b, %c, %d, %e, %f, %o, %s, %u, %x, %X, and others, but not %a.