Multi-choice problem: Choose from the options at the end, and answer how do you do this: how to clean a cast iron skillet

Options are:
a). pour some coarse salt into the pan and use half a potato to rub it in until that mess has broken up and can be rinsed away.
b). pour some coarse salt into the lint trap and use half a potato to rub it in until that mess has broken up and can be rinsed away.
a).