Which version of PHP introduced the visibility keywords i.e public, private, and protected?

A. PHP 4

B. PHP 5

C. PHP 5.1

D. PHP 5.3

Answer: Option B

Solution(By Examveda Team)

In PHP 4, all properties were declared with var keyword, which is identical in effect to using public. For the sake of backward compatibility, PHP 5 accepts var in place of public for properties.