Assume that a Boolean gate cost $$0\mathrm{.}001$ USD, with a delay of $5$ns and a power consumption of $0\mathrm{.}01$ mw$.1-$ Explain how you can use the available circuits elements to build your $48-$bit adder $(3$ pts$).2-$ Provide all possible combinations of $48-$bit adders that can be achieved with the library components $(6$ pts$).$