3. The following questions refer to the skeletal C++ program shown below (a) Assume that static scoping is used. List all variables, along with the functions in which they are declared, that are visible at Line 1 in the program. If the variable was declared within an if statement, state which if statement (e.g. a (if of fl)) (b) Repeat part (a), but list the variables that are visible at Line 2. (c) Repeat part (a), but list the variables that are visible at Line 3 (d) Repeat part (a), but list the variables that are visible at Line 4. (e) Repeat part (a), but list the variables that are visible at Line 5. (f) Assume that dynamic scoping is used, and that main calls fi, which calls f2. (Assume that fl calls f2 on Line 2.) List all variables, along with the functions in which they are declared, that are visible at Line 4 in the program. If the variable was declared within an if statement, state which if statement (e.g. a (declared in if block of fl)