Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to perform young's double slit experiment [title] Set up the optics bench : [substeps] Begin with the optics bench in front of you with the 0 centimeter (0.0 in) mark on your left. Install the diode laser at the 0 centimeter (0.0 in) mark facing towards the right. This should require little effort.

Ending1: Perform the horizontal slit at the 5 centimeter (0.0 in) mark. Flip the diode torch over to the other side. Ending2: [title] Position the coated point of the laser gun on top of the metal panel. [step] As you push the laser upward, your laser can melt off the metal panel to reach the shiny surface underneath. Ending3: Mount the multi-slit apparatus to its appropriate mount. This may require some force and will make a clicking sound when properly installed. Ending4: Remove only the two blue strips called' blue' and' red'. Align the laser and red strip together 1 meter (0.4 in) from the left.

Answer format: ending1/ending2/ending3/ending4