What shortcut initiates recording in Pro Tools?

The shortcut that initiates recording in Pro Tools is F12. This key is explicitly programmed to start the recording process, allowing users to quickly begin capturing audio or MIDI directly into their timeline. This function reflects a common convention in many digital audio workstations (DAWs) where a designated function key is used to streamline the recording workflow, making it easier for users to focus on their performance instead of navigating through menus or clicking on buttons.

In contrast, the other choices represent different functions or commands in Pro Tools, which do not trigger the recording action. Understanding the specific function of F12 in the workflow of Pro Tools is essential for efficiently managing recording tasks and keeping the creative flow intact during a session.