From the given options, choose the one which gives the correct meaning / explanation for the expression

To die in harness

To die while in service

The correct answer is option 3: To die while in service

To die in harness" means to die while still actively working or holding a position, rather than after retiring or stepping away from duties. It often refers to someone who passes away while still engaged in their job or passion. The idiom originates from the image of a horse dying while still wearing its harness and pulling a load — symbolizing continuous service until death.