Which of these communication devices was first mass-produced for military use during WWII, then became a revolutionary civilian product after Motorola's commercial launch in 1973?

World War II saw incredible advancements in military technology, with many products developed during wartime later finding their way into civilian markets. One particular product launch revolutionized battlefield communication and later transformed civilian telecommunications. This poll tests your knowledge about a pivotal military technology product that bridged the gap between military application and civilian use in the post-war era.

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The handheld two-way radio (walkie-talkie), which evolved into the cellular mobile phone
The field telephone, which evolved into the cordless home phone
The military telegraph system, which evolved into the fax machine
The military radar display, which evolved into the television