What will be the output of the following PHP code? <?php $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43"); print_r(array_change_key_case($age, CASE_UPPER)); ?>

Array ( [PeTeR] => 35 [BeN] => 37 [Joe] => 43 )

Array ( [Peter] => 35 [Ben] => 37 [Joe] => 43 )

Array ( [peter] => 35 [ben] => 37 [joe] => 43 )

Array ( [PETER] => 35 [BEN] => 37 [JOE] => 43 )

What will be the output of the following PHP code? <?php $age = array

1.	What will be the output of the following PHP code? `<?php $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43"); print_r(array_change_key_case($age, CASE_UPPER)); ?>`
A.	Array ( [Peter] => 35 [Ben] => 37 [Joe] => 43 )
B.	Array ( [peter] => 35 [ben] => 37 [joe] => 43 )
C.	Array ( [PETER] => 35 [BEN] => 37 [JOE] => 43 )
D.	Array ( [PeTeR] => 35 [BeN] => 37 [Joe] => 43 )
Answer» D. Array ( [PeTeR] => 35 [BeN] => 37 [Joe] => 43 )