Which statement is efficient and why? x=x+1; or x++;? (5p) What is the type of the variables that you declared in the main with regards to their visibility/scope? Provide a code snippet explaining the difference between the two types of variables in C. (5p) Some coders debug their programs by placing comment symbols on some codes instead of deleting it. How does this aid in debugging? (10p) How many types of errors you know in C language? Explain the difference? (10p)