Which command is used to add users to or from existing roles?

A.
Add rba user <User Name> roles <List>

B.
Add rba user <User Name>

C.
Add user <User Name> roles <List>

D.
Add user <User Name>

Explanation:

Configuring Roles – CLI (rba)

https://sc1.checkpoint.com/documents/R76/CP_R76_Gaia_WebAdmin/73101.htm