the seal affixed on important letters by prophet (SAW) was in the Custody of ?

A. Hazrat Ali (RA)
B. Hazrat Qais RA
C. Hazrat khuzaifa (RA)
D. Hazrat Bilal (RA)

The correct answer to the question: "the seal affixed on important letters by prophet (SAW) was in the Custody of ?" is "Hazrat khuzaifa (RA)".