Suppose we have two implementations of the same ISA:

Machine Clock Cycle time CPI

A $200$psec $2$

B $400$psec $2$

What is Perfomance of B when compared to performance of A$?$

B is the same speed as A$.$

B is twice as fast as A$.$

B is half as fast as A$.$

B is four times as fast as A$.$