https://helpcenter.veeam.com/docs/one/monitor/about_alarms.html?ver=120 C: Alarm Management

Alarm Management

Veeam ONE's Alert Management feature can be configured to detect potential ransomware attacks by monitoring various system and security metrics. When configured appropriately, it can generate alerts or notifications when suspicious activity or patterns indicative of ransomware are detected. These alerts can then trigger predefined mitigating actions or notifications to help prevent or mitigate the impact of a ransomware attack

it's alarm

C. Alarm https://www.google.com/search?q=configure+veeam+one+to+detect+ransomware&rlz=1C1GCEU_frBE992BE992&oq=configure+veeam+one+to+detect+ransomware&aqs=chrome..69i57j33i160l2j33i22i29i30.12408j0j7&sourceid=chrome&ie=UTF-8#fpstate=ive&vld=cid:b434bf61,vid:VKfQDYNfi7s,st:31

Navigating through the VeeamONE-Client GUI there is no evidence of any "alert" the little bell symbols are always named ALARMS. In the left bottom corner you find the "Alarm Management" section.

C Veeam ONE is a monitoring, reporting, and capacity planning tool for Veeam Backup & Replication and virtual infrastructures, including VMware vSphere and Microsoft Hyper-V. Veeam ONE provides real-time monitoring, historical analysis, and business reporting for backup and virtual infrastructures. One of the features of Veeam ONE is its alarm management capability. Veeam ONE can monitor for suspicious activity and notify administrators when something is amiss. For example, Veeam ONE can detect when a potential ransomware attack is happening and be configured to take mitigating actions, such as alerting administrators, pausing backup jobs, or quarantining affected VMs.

C is correct

B is correct https://www.veeam.com/blog/one-ransomware-alarms.html