Notifications can be sent using which of the following methods?

The option indicating "All of these" is correct because notifications in Mimecast can indeed be sent through multiple channels, which includes SMS, email, and alternative email addresses.

The ability to send notifications via SMS allows for quick alerts to users on their mobile devices, ensuring important messages are received even when they are away from their computers. Email notifications are standard for many systems, providing a reliable method for delivering information directly to a user's inbox. Additionally, allowing notifications to be sent to an alternative email address offers flexibility and convenience for users who may want to receive information at a different or backup address.

Utilizing all these methods enhances the overall responsiveness and effectiveness of the communication system, ensuring that users can be kept informed through their preferred communication channels. Thus, the option that encompasses all these methods illustrates the comprehensive capabilities of the Mimecast notification system.