Using a Carestream Digital Imaging System, If an Image's EI

Using a Carestream digital imaging system, if an image's EI number is 1800 while the optimal range ends at 1200, this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

A) Underexposed; doubled
B) Underexposed; increased by a factor of four
C) Overexposed; halved
D) Overexposed; reduced by a factor of four