What will be the output of the following PHP code?

• A. rray ( [a] => blue [b] => yellow [c] => red [d] => green )
• B. rray ( [0] => blue [1] => yellow [2] => red [3] => green )
• C. rray ( [0] => red [1] => green [2] => blue [3] => yellow )
• D. rray ( [a] => red [b] => green [c] => blue [d] => yellow )