To mark all contents of a folder as read, you would:
Click the Folder tab and choose mark all as read from the clean-up group
Press Ctrl + Alt + R
Click the filter email button and choose Mark All
None of the above
Correct answer is A
To mark all contents of a folder as read, you would click the Folder tab and choose "mark all as read" from the clean-up group. This option is specifically designed to mark all the unread messages in a folder as read, allowing the user to easily manage their inbox and keep track of important emails.
The other options listed (Press Ctrl + Alt + R and Click the filter email button and choose Mark All) are not the correct methods to mark all contents of a folder as read.