The purpose of a block to add a value to the end of an array.
The push() is known to be often used to add an element to the end of your array.
The end() function is known to be one that transmit the internal pointer to, and also the outputs, the last factor in the array.
A null or zero value is known to be that which marks the end of an array and it is said to be the very equivalent of the null char for any kind of string
Hence, in the above scenario, The purpose of a block to add a value to the end of an array.
Therefore, option D is correct.
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