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

• 1 : extern int x;
• 2 : float square ( float x ) { ... }
• 3 : double pow(double, double);
• A. 1
• B. 2
• C. 1 and 3
• D. 3