For a certain program, $2\%$ of the code accounts for $50\%$ of the execution time. Com pare the following three strategies with respect to programming time and execution time. Assume that it would take $100$ man$-$months to write it in C$,$ and that assembly code is $10$ times slower to write and four times more efficient. a$.$ Entire program in C$.$ b$.$ Entire program in assembler. c$.$ First all in C$,$ then the key $2\%$ rewritten in assembler.