We can also use masking to examine or set a particular bit in a memory location or register. This involves using the logical operations AND and OR, one of whose operands is the memory location/register and the other is a binary mask, a string as long as the memory location/register. Given this information: (a) Describe how you would clear a particular bit, say 4, in register 0, leaving all other bits alone; i.e., what is the logical operation, and what would the mask look like? (b) Show how you would do this in the PCs assembly language. (c) Describe how you would set bit 4 in register 0, leaving all other bits alone. (d) Show how you would do this in the PCs assembly language.