shutdown storage server

I recently attempted the X5 exam and there was a question on safely shutting down 3 storage servers for a battery replacement.  Was not mentioned if its a quarter, half or full rack.  I dont remember the exact answers, but here is a snippet

A. shutdown -h now from the storage server

B. cellcli> list griddisk where status ! = 'inactive'

C. cellcli> list griddisk attributes name where asmdeactivationoutcome ! ='Yes'

D. crsctl stop cluster

E. cellcli> alter griddisk all inactive

I am supposed to choose 2 answers.  But I see 3 candidates here - A, C and E.  B also looks likely.

I used this doc for refererence -