Answer:
Windows OS: Ctrl + F5 .
Mac OS: Command + ⇧Shift + R .
Step-by-step explanation:
Rob needs to first know what operating system he is using. Depending on the operating system he is using, the most popular opeeating system(OS) are Mac and Windows and depending on which operating system Rob has he can use the appropriate command/shortcut key.
This method of refreshing a page helps clear the page(cache).