You have completed a forecast of historical data and calculated MAD to be $=50\mathrm{.}0$ and bias to be $=-55\mathrm{.}0.$ Which of the following statements is TRUE?

a$.$ your average error is $50$ units and you are overforecasting all of the time

b$.$ your average error is $55$ units and you are underforecasting all of the time

c$.$ your average error is $50$ units and you are overforecasting more than you are underforecasting

d$.$ your average error is $55$ units and your are underforecasting more than you are overforecasting

e$.$ you have made a calculation mistake