When Using Multileaf Collimation,which Concerns Need to Be Evaluated

When using multileaf collimation,which concerns need to be evaluated?

A) penumbra between the leaves and the transmission of the leaves
B) movement of MLCs during the treatment give variation in dose that need to be evaluated along with penumbra between the leaves
C) movement of MLCs during treatment and interleaf transmission leakage
D) penumbra at the end of the leaves and interleaf transmission leakage