3. Hand-trace the following code, assuming that a is 2 and n is 4. Then explain what the code does for arbitrary values of a and n. nt r 1 inti- 1; while (in) Hand Tracing Table Goes Here: 4. Trace the following code. What error do you observe? nt n 1 while (n50) cout s n nen+10; Hand Tracing Table Goes Here