What is the name of the file whose global read bit would control the ability of normal users to get useful information from the who and w commands?

(Provide full name and path)

Answer: /var/run/utmp

Explanation/Reference:
From the man pages:
The  utmp  file allows one to discover information about who is currently using the system. There may be more users currently using the system, because not all programs use utmp logging.