C-Wire on New T-Stat installation

Hello,

I am new to the forum and glad to be here. I have spent some time browsing and have not found exactly the answer I am looking for.

I just bought a thermostat that is wi-fi enabled and requires power from the C wire. When I detached my old thermostat, the W, Y, G, and R wires were connected. There were also two orange, a blue, and a black wire bundled, but not connected to anything.

If it helps, it is the 3M Filtrete wi-fi/touchscreen t-stat and I have a York air handler.

I looked at the wire panel in my air handler and the same wires (2 O, Blue, and black) were present, but not connected. On the panel, there is a white wire connected to the C terminal, but does not run to the thermostat, it goes somewhere else, not sure where.

My question is this: can I use one of the disconnected wires (orange, blue, or black) as my C wire? This would entail having TWO wires connected to the C terminal at my air handler. IS THIS POSSIBLE OR WOULD THIS NOT WORK?

I just want to make sure this will work before I try it out. Thanks in advance for your help!