How can an administrator inform a pool user that a recompose will take place?

A.
click on Users and Groups > select pool > click Send Message

B.
click on Pools > select their pool > click Sessions tab > highlight user > click Send Message

C.
click on Pools > highlight their pool > click More Commands > choose Send Message

D.
click on Global Settings > click Edit > check Display warning before recompose > enter a
message