Consider three different processors P$1,$ and P$2$ executing the same instruction set with clock rates and CPIs specified in the following table:

$\backslash$table$[[$Processor$,$Clock Rate,CPI$],[$P$1,3\mathrm{.}85$ GHz$,2\mathrm{.}63],[$P $2,5\mathrm{.}01$ GHz$,3\mathrm{.}42]]$

Which processor has the fastest performance?

a$.$ P$1$

b$.$ P$2$