A, as the question asks for delaying the whole update:
https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/software-and-content-updates/best-practices-for-app-and-threat-content-updates/best-practices-mission-critical.html
B is not relevant as it would disable the automatic updates.
C involves manual/admin action to install the update which is not "certain amount of time".
D would not delay the install of the content update, but disable the new Apps from it.
Correct answer is A.
Enter how long after a release to wait before performing a content update in the Threshold (Hours) field. In rare instances, errors in content updates may be found. For this reason, you may want to delay installing new updates until they have been released for a certain number of hours.
None of the options are perfect in my opinion. There are two thresholds that can be set in a schedule - Threshold (hours) which is the time to wait when a new app and threat update is available before taking the action (download only or download and install) or New App-ID Threshold (hours) which delays the installation.
I think the question need to be worded more clearly. If it auto-install A, if it wait for approval C.
This is verbatim from their website.
"Schedule content updates so that they download-and-install automatically. Then, set a Threshold that determines the amount of time the firewall waits before installing the latest content. In a security-first network, schedule a six to twelve hour threshold."
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