Final answer:
The provided historical information regarding presidential term limits does not relate to the question about the maximum number of years an E-4 can remain on active duty. An accurate answer requires context-specific military information not supplied here. option 2 is correct
Step-by-step explanation:
option 2 is correct The maximum number of years an E-4, which is a military rank (for example, Corporal or Specialist in the U.S. Army, and Senior Airman in the U.S. Air Force), can remain on active duty varies by service and circumstances. The question provided does not correspond to the historical reference about the presidency and term limits provided, which is unrelated to military service durations.
Thus, the question appears to be about military service terms rather than presidential term limits. The accurate answer pertaining to the maximum period an E-4 can serve is not provided here due to a lack of relevant context or information in the supplied content. For accurate information on military enlistment terms and career lengths, it is recommended to consult official military resources or speak directly with a military career advisor.
An E-4, which refers to a rank in the military, is typically allowed to remain on active duty for a maximum of 6 years.