What collar device does an O-4 in NJROTC have?

In the NJROTC (Naval Junior Reserve Officer Training Corps) program, an officer's rank is reflected in the insignia worn on their uniform. Specifically, for the rank of O-4, which corresponds to the rank of Lieutenant Commander, the correct collar device consists of four attached gold bars.

This insignia distinguishes the officer within the military structure, indicating their rank and leadership position. The number of bars is important in recognizing and differentiating ranks, as each officer rank has its own specific insignia to represent their level of authority and responsibility.