Which program flow charting symbol can be used to indicate the beginning and the end of an algorithm?

The reverse lookup file maps IP addresses to hostnames by using a special domain name that ends in __________

a. DNS b. Com c. in-addr.arpa d. local

In a ____ system, the subject's access permissions are assigned based on the security attributes that they possess and the rules that have been established for those attributes.

A. mandatory access control B. role-based access control C. discretionary access control D. delegated access control