Question: Which of the options below is a valid function declaration? 1. foo(12); 2. foo(int x); 3. int foo(12) { return ((x*x)/2)); } 4. int foo(int

Which of the options below is a valid function declaration?

1. foo(12);

2. foo(int x);

3. int foo(12) { return ((x*x)/2)); }

4. int foo(int x);

5. int foo(int x) { return ((x*x)/2)); }

6. int foo() { return ((x*x)/2)); }

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