Answer:
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.
