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How should class MyObject be defined for the following code to work properly?

How should class MyObject be defined for the following code to work properly? Assume $array is an array and MyObject is a user-defined class.

$obj = new MyObject();

array_walk($array, $obj);

A.

MyObject should extend class Closure

B.

MyObject should implement interface Callable

C.

MyObject should implement method __call

D.

MyObject should implement method __invoke

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