RAT 5, don't be so hard on him. First, the indication could be in a CBT, not necessarily in the SIM. CBTs are often boeing generic and boeing does like to show off its options. And if his airline doesn't have this option they won't be able to explain it. Therefore a question here is not a bad idea at all, more than enough different boeing pilots on here that can explain some of those options.
I was rather surprised myself to learn that IAN is apparently an option, not standard. It is in my view one of the best integrated approach system on the market in bigger planes, don't know what those shiny blinking new business jets have in their next gen avionics suite. Therefore i would have guessed that all airlines select it, as it is in my view an additional safety tool as well.