In data structures, a union can be defined as $($Option A$,$ B or C$)$:

A$.$ A union is an object similar to a structure except that all of its members start at the same location in memory. A union variable can represent the value of only one of its members at a time.

B$.$ A union contains an ordered group of data objects. Unlike the elements of an array, the data objects within a structure can have varied data types. Each data object in a structure is a member or field.

C$.$ A union is a more flexible variation of an array, in which name$-$value pairs can be added and deleted freely.

C

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None of the options

A