Which display provides cockpit pressure altitude and differential pressure?

The Alternate Engine Data Display (AEDD) is the correct answer because it specifically presents critical engine parameters, including cockpit pressure altitude and differential pressure. This display is designed to provide important information about the engine's performance and operational status, ensuring pilots have access to essential data during various phases of flight.

The distinction of the AEDD lies in its tailored focus on engine performance metrics, which is crucial for monitoring the engine's health and making informed decisions. This specialized display enhances situational awareness regarding the engine's operational limits, particularly in situations that may fall outside of standard operating conditions.

In contrast, other displays, such as the Emergency Engine Display (EED), Engine System Display (ESD), and Primary Flight Display (PFD), serve different primary functions. While they may include some engine parameters, they do not provide the specific combination of cockpit pressure altitude and differential pressure as the AEDD does, making it the essential tool for assessing engine data in detail.