Before a structure can be used, it must be

A.

declared

B.

deallocated

C.

initialized

D.

All of the above

A. declared

Explanation:

Before a structure can be used, it must be declared.

For example:

/ / Structure definition

struct s{

int a;

char b;

};

/ / Structure instantiation

struct s mystruct;

/ / This is where a structure instance called mystruct is created whose

/ / datatype is struct s.

mystruct. a = 10;

mystruct. b = 'c';

As we can see from the example definition precedes use for the structure.