According to the CRISC Review Manual, the average time to grant access privileges is the best indicator of the efficiency of a process for granting access privileges, because it measures how quickly and effectively the process can respond to the access requests and meet the business needs. The average time to grant access privileges can be calculated by dividing the total time spent on granting access privileges by the number of access requests processed. The other options are not the best indicators of the efficiency of the process, because they measure other aspects of the process, such as the quality, the security, or the maintenance. The number of changes in access granted to users measures the quality of the process, as it indicates how wellthe process can align the access rights with the user roles and functions. The average number of access privilege exceptions measures the security of the process, as it indicates how often theprocess deviates from the established policies and standards. The number and type of locked obsolete accounts measures the maintenance of the process, as it indicates how well the process can remove the unnecessary or outdated accounts. References = CRISC Review Manual, 7th Edition, Chapter 4, Section 4.1.2, page 163