Penalty Enforcement

[bossman72]

I've recently started to read the rules on penalty enforcement and i'm not too sure on a couple situations... here's one of them:

On a pass play, let's say an A player holds (a) while the QB is in the pocket, (b) while the ball is thrown in the air, or (c) after a receiver makes a catch.

If i'm not mistaken, the basic spot for enforcement on a loose ball play is the prev line of scrimmage.

I'm pretty sure (a) and (b) are enforced from the LOS, but i'm confused on (c). If this was a 60 yd play, and the hold occurred near B's goal line, it doesn't seem right that this would be enforced from the prev LOS... i want to say this would be a spot foul, but i thought fouls by the O in front of the basic spot are penalized from the basic spot...

Set me straight, fellas. Thanks