关于SA-299题库里头的疑问:/etc/user_attr文件

[weixin_38069570]

given the entry from the /etc/user_attr file :
user10::::profiles=user security,maintenance and repair;
roles=mediaadmin;type=normal
Which statement is correct?
A. The user10 account is a normal role account.
B. The role MediaAdmin is defined in the /etc/security/auth_attr file.
C. The profiles User Security and Maintenance and Repair are defined in the
/etc/security/prof_attr file.
D. The profile called User Security,Maintenance and Repair is defined in the
/etc/security/prof_attr file.
Answer: C
该题要怎么解释?书里头介绍了一点,但还是没看懂.请高手指导