Which military communication innovation from WWII directly influenced the development of modern wireless consumer products like Bluetooth technology?

Throughout history, military product innovations have often transformed warfare and later found their way into civilian applications. Many technologies we use daily originated as military developments. This poll explores a significant product innovation from military history that revolutionized battlefield communications and eventually influenced consumer technology trends. Test your knowledge about how military innovation shaped modern product development!

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Frequency-hopping spread spectrum technology, co-invented by actress Hedy Lamarr
The walkie-talkie field radio developed by Motorola for the US Army
ENIAC (Electronic Numerical Integrator and Computer) developed for artillery firing tables
The SCR-300 backpack radio used for infantry communications