Suppose some object has a charge of -1 Coulomb. Which of the following could be true?
a. There are about 1.6 x 10^19 excess electrons on the object.
b. There are about 1.6 x 10^19 electrons that have been removed from the object.
c. There are about 6.25 x 10^18 excess electrons on the object.
d. There are about 6.25 x 10^18 electrons that have been removed from the object.