$1.$ Suppose the costs of duplicating processes A$,$ B$,$ and Care $$80,000,$ $$90,000,$ and $$60,000.$ Which of the following is the least expensive approach to achieve a system reliability of at least $0\mathrm{.}88?$a$.$ Duplicate process B only.b$.$ Duplicate processes A and B$.$c$.$ Duplicate processes A and C$.$d$.$ Duplicate processes B and C$.$a$2.$ The system reliability goal is$0\mathrm{.}80.$ The costs for duplicating processes A$,$ B$,$ and C are $$30,000,$ $$40,000,$ and $$20,000.$ Which process should be duplicated?a$.$ Process A$.$b$.$ Process B$.$c$.$ Process C$.$d$.$ Either Process A