Why Would a Physician Performing Electroconvulsive Therapy Choose to Go

Why would a physician performing electroconvulsive therapy choose to go with unilateral administration over bilateral administration?

A) Because it reduces the chance of skin burns that are commonly experienced with bilateral administration.
B) Because it uses less electricity and is therefore less expensive, while still attaining the same outcomes.
C) Because it reduces the need for muscle relaxants before the treatment.
D) Because it reduces the memory loss that can be a side effect of ECT.