states array ohio iowa arizona uniquestates arrayunique printr this returns the..., PHP Arrays, PHP

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Question:$states = array("Ohio", "Iowa", "Arizona", "Iowa", "Ohio");
$uniqueStates = array_unique($states);
print_r($uniqueStates); 

This returns the following:

A Array ( [2] => Ohio [2] => Iowa [1] => Arizona ) 
B Array ( [2] => Ohio [1] => Iowa [2] => Arizona ) 
C Array ( [0] => Ohio [1] => Iowa [2] => Arizona ) 
D Array ( [0] => Ohio [2] => Iowa [2] => Arizona )

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Question:$states = array("Ohio", "Iowa", "Arizona", "Iowa", "Ohio"); $uniqueStates = array_unique($states); print_r($uniqueStates); This returns the following:

A Array ( [2] => Ohio [2] => Iowa [1] => Arizona )

B Array ( [2] => Ohio [1] => Iowa [2] => Arizona )

C Array ( [0] => Ohio [1] => Iowa [2] => Arizona )

D Array ( [0] => Ohio [2] => Iowa [2] => Arizona )

C