What is a fake antivirus app on mobile platforms, and what specific permissions or behaviors should alert users?

• A.Fake products are distinguishable from real ones by the scan engine they ship, and a genuine vendor licenses a recognized detection library (the about screen names it): the red flags are the absence of that attribution, the missing certification badge, and the lack of an independent test result, with permissions playing no part in the assessment
• B.Fake mobile antivirus apps display alarming (fake) virus detection alerts to pressure users into purchasing premium versions, granting dangerous permissions (Accessibility Service, Device Admin, notification access), or providing credit card details; red flags: apps claiming to find multiple viruses on a freshly installed device, excessive permission requests (accessibility, notification listener, device admin), high subscription prices, newly created developer accounts, requests to install additional apps, and poor grammar in alerts
• C.