How can a user change the range of cells that a conditional formatting rule applies to?

a: clear the rule first and reapply it as it cannot be modified.
b: in the conditional formatting rules manager dialog box, edit the cell range for the rule in the applies to section.
c: clear all rules that have been applied to the worksheet or selected range by clicking on the clear rules button.
d: right-click the cell range and select update conditional formatting rule from the menu list.