Which of the following choices concerning the net magnetic flux through any enclosed surface is true according to gauss' law for magnetic fields? select one: a. the net magnetic flux in this case would be a vector quantity equal to the enclosed magnetic field. b. the net magnetic flux in this case would be a positive scalar quantity c. the net magnetic flux in this case would be a vector quantity equal to the number of magnetic monopoles passing through the surface per unit time. d. the net magnetic flux in this case would be a negative scalar quantity. e. the net magnetic flux in this case would be equal to zero.