Client Connector automatically checks for software updates on a recurring schedule so endpoint agents remain current without manual user action. The tested default software-update interval is two hours. Option C (Every 2 hours) is correct because the automatic software-update check occurs every two hours.
Why the other options are incorrect:
A). Every 6 hours: Six hours would delay client software update checks beyond the default cadence. Zscaler Client Connector checks the software update policy every two hours.
B). Every 12 hours: Twelve hours is far too slow for the default software update policy check. The default interval is two hours.
D). Every 24 hours: Twenty-four hours would mean only a daily update-policy check. ZCC checks software update policy much more frequently: every two hours.