Which product design innovation, first widely deployed in WWII, revolutionized fighter aircraft capabilities and remains a fundamental element in modern military aircraft design?

The evolution of military equipment design has directly influenced combat effectiveness throughout history. Some products transformed warfare so dramatically that they created paradigm shifts in military strategy and tactics. This poll tests your knowledge about a groundbreaking product design innovation from World War II that continues to influence military equipment development today. Can you identify which design innovation revolutionized aerial combat capabilities?

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The bubble canopy, providing pilots 360° visibility and reducing blind spots that previously led to high casualty rates
Pressurized cabins, allowing pilots to fly at higher altitudes without requiring oxygen masks
Ejection seats, enabling pilots to safely escape disabled aircraft at high speeds
Flight control systems with hydraulic assistance, reducing pilot fatigue during extended combat missions