Can you help me with this question? just multiple choice but need a reason why we choose those answer

Suppose that the system from the previous question has been turned into a multiprogramming system with all the devices capable of operating independently. Suppose that two identical programs are being run concurrently. Each of those programs, when run alone (no other program being present in the system), spends (as before) 70% of its time using the CPU, with the remaining 30% equally partitioned among the remaining three hardware components (the exact activity pattern is unknown), and completes in 10 minutes. What is the minimum amount of time needed to complete both programs concurrently in the multiprogramming system? a. 7 minutes b. 10 minutes c. 12 minutes d. 14 minutes e. 17 minutes Question 3: Below we list a few sample machine instructions available in some hypothetical ISA: MOVPC: copy the contents of the program counter (PC) to the indicated general register of the CPU SETPSW: copy the contents of the indicated general register of the CPU to the PSW (state) register MOVPTP: copy the contents of the page table pointer (PTP) register to the indicated general register of the CPU SETPTP: copy the contents of the indicated general register of the CPU to the page table pointer (PTP) register What is the minimum subset of those instructions that must be privileged? a. all of them b. none of them c. MOVPC and MOVPTP d. SETPSW and SETPTP e. MOVPC and SETPTP f. SETPSW and MOVPTP g. MOVPC, SETPTP, and MOVPTP h. SETPSW, MOVPTP, and SETPTP