In the shown Wheatstone-bridge experiment, which key should be pressed first: K₁ or K₂? Image

Options

• Option A

  Key K₁ should be pressed first and then K₂.

• Option B

  Key K₂ should be pressed first and then K₁.

• Option C

  Any key can be pressed in any order.

• Option D

  Both keys should be pressed simultaneously.