What is the most widely accepted origin of the name 'Jeep' for the iconic military vehicle first widely used in World War II?

The military vehicle that would become known as the Jeep was a revolutionary design that changed battlefield mobility forever. While its rugged capability is well-known, the origin of its iconic name has been debated by military historians for decades. Test your knowledge of this famous military brand's history with this challenging question about how the ubiquitous 'Jeep' name came to be.

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From 'GP' (General Purpose vehicle), the military designation which soldiers pronounced as one word
Named after 'Eugene the Jeep', a magical character from the Popeye comic strips who could solve complex problems
An acronym for 'Just Enough Essential Parts', reflecting its minimalist but effective design
From the French 'jipe', a term for lightweight reconnaissance vehicles used by the French military