What is the best antivirus to use on a Mac-book? My granddaughter has one she uses it for college. When she bought it there was Web root Anywhere on it but the subscription is lapsed. I was looking at the free ones but they are Avast, AVG and some others which I will not use. She had some adware on there so I took that out with Malwarebytes. Would Malwarebytes premium be enough to put on. I don't know much about Apple systems so I appreciate any advice. I offered to pay for something for her (she is a starving college student her last year) so I wanted to help keep her Mac safer. Web root has a good rating from a site I checked on the internet but I've never used it.