View the Exhibit to observe the roles assigned to the SLP_REP user. 
Which statement is true about the assignment of the SELECT_CATALOG_ROLE role to the SLP_REP user?
A.The user must enable the role explicitly.
B.The user can grant the role to other users.
C.The user cannot use the role until the DBA enables it explicitly.
D.The user can start using the role immediately without any changes.
select_catalog_role 是一种角色，题中默认为 N，需要重新登录或者显式的 set role 来生效，所以选 A。
