identify which of the following are declarations 1 extern int x..., Basic, C++

Question: Identify which of the following are declarations
1 : 	extern int x;
2 : 	float square ( float x ) { ... }
3 : 	double pow(double, double);

A 1 
B 2 
C 1 and 3 
D 3

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Question: Identify which of the following are declarations 1 : extern int x; 2 : float square ( float x ) { ... } 3 : double pow(double, double);