Processors A and B use the MESI protocol for cache coherence. Give the final state for a cache line given the starting conditions listed below and the action that takes place:

a)

State of line in A is I

State of line in B is E

A reads the line

b)

State of line in A is S

State of line in B is S

A writes the line

c)

State of line in A is M

State of line in B is I

B reads the line

d)

State of line in A is I

State of line in B is I

B reads the line