my answer is D

D seems correct. "For example, you can receive an email notification when the Connections counter for a content switching virtual server reaches a specified value." https://docs.netscaler.com/en-us/citrix-application-delivery-management-service/networks/network-reporting.html

Other Dumps all tell d as correct answer.

Same as 1Y0-240 "Configure Network Reporting on the NetScaler MAS by setting the threshold and email address." so it should be D.

Correction. D. is correct. Network reporting allows thresholds and email reporting. https://docs.citrix.com/en-us/citrix-application-delivery-management-service/networks/network-reporting.html#:~:text=How%20to%20manage,threshold%20is%20breached.

I would go with C. https://docs.citrix.com/en-us/citrix-application-delivery-management-software/current-release/analytics/settings/how-to-create-thresholds-and-alerts-using-mas.html#:~:text=You%20can%20also%20associate%20an%20action%20with%20the%20threshold.%20Actions%20include%20sending%20an%20alert%2C%20email%2C%20or%20SMS%20notification.%20When%20the%20threshold%20is%20breached%2C%20Citrix%20ADM%20performs%20the%20action%20you%20define%20is%20taken%20automatically%20like%20enabling%20an%20alert%20and%20sending%20an%20email%20or%20SMS%20notification.

Yes, it could be C. https://docs.citrix.com/en-us/citrix-application-delivery-management-service/networks/events/how-to-set-repeated-email-notifications.html

Voting for C, network reporting does not generate alerts to administrator.

Valid D. https://docs.citrix.com/en-us/citrix-application-delivery-management-service/networks/network-reporting.html

Voting D