receiver's rca outputs for amp

Hey all, I tried running a search for this but didn't find anything specific.

I'm trying out my first subwoofer/amp install on my girlfriend's car - I used to install emergency vehicle equipment, so I'm familiar with auto electronics - I'm just confused about the RCA outputs on the back of the receiver - Sony CDX-GT72W - It's got three sets of jacks: BUS AUDIO IN, AUDIO OUT FRONT, AUDIO OUT REAR, then it's got some outputs on about 6" of wire labeled SUB OUT (MONO). Now, I know I'm going to sound like and idiot with this question...I've come to terms with that, I just need to know what to do and figured this would be the best place to ask.

I'm setting up one 10" 4 Ohm SVC woofer to a 2-channel amp, but which RCA output should I use? The amp isn't Mono, so should I use the Audio Out Rear or should I use the Sub Out (Mono) jack?

Thanks much for any and all help!

Great, thanks man, appreciate it!

I guess the Mono is just because it's a single sub output?