Given$)$ Imagine a program where twenty five percent of its execution is serial while the remaining seventy five percent is embarrassingly parallel $($performance scales linearly with the number of cores available$).$ For each part, provide a step$-$by$-$step solution and an explanation of the limits$.$ i$).$ What is the maximum possible speedup that can be achieved for the program, regardless of the number of cores available? ii$.)$ If the system has $8$ cores, what is the maximum speedup achievable?