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Answer would be 4) Dope Vector

In computer programming, a dope vector is a data structure used to hold information about a data object, e.g. an array, especially its memory layout.

A dope vector typically contains information about the type of array element, rank of an array, the extents of an array, and the stride of an array as well as a pointer to the block in memory containing the array elements.

Read here details if you want. 

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