Given the following skeletal C function and assuming nested blocks are implemented using static-chain process, select all statements that are TRUE: 1. void main() { 2. int a, b; 3. while (...) 4. intc; 5. if (...) int a, di 7. } // end if 8. } // end while 9. } It is more efficient to implement blocks using static-chain process rather than treating them as if they were local function variables Static-depth level of variable d defined on line 6 is 3 The activation record instance for while should contain a static link to main Static-depth level of variable a defined on line 2 is 0 The activation record instance for if should contain a static link to main