Pressing the SEC PLN pushbutton on the MFC displays the secondary flight plan in which format?

The secondary flight plan, when the SEC PLN pushbutton on the Multi-Function Control (MFC) is pressed, is displayed in the ND MAP format. This format allows pilots to visualize the secondary route graphically on the navigation display, making it easier to understand and assess the flight plan's structure and waypoints in relation to the current route and navigational features. The map view provides situational awareness as it incorporates real-time information about the aircraft's position, surrounding airspace, and other relevant navigational data.

This graphical representation contrasts with other display formats, such as PFD format or ND COMPASS format, which provide different types of information not specifically designed for detailed route visualization in the same way.