Which two are true about accounts, groups, and roles in the Solaris user database?

Which two are true about accounts, groups, and roles in the Solaris user database?

A.
A Solaris account name may be any alphanumeric string, and can have a maximum
length of 8 characters.

B.
Account UID numbers 0-09 are system-reserved.

C.
The GID for an account determines the default group ownership of new files created by

that account.

D.
The groups that an account is a member of are determined by the entries in the
/etc/group file.

E.
All Solaris user accounts must have a unique UID number.