Asking advice for line of putt

Real simple one here that I'm pretty sure I know the answer to. Is there any circumstance where you can ask either your playing competitor or your partner for advice of line of putt?

Does the format of the game make a difference i.e. 2 man scramble, 2 man best ball, 2 man alternate shot? Or even just a regular game, either stroke play or match play. Can you ask your partner of competition what they see in a putt?

On the PGA, clearly the caddies and players are looking over putts. Obviously this is permitted, but the caddie can't stand and give a "target" for the player to hit towards, right?

The caddie can help align the golfer, but I think they have to move away before they putt.

Multiple questions, so multiple answers.

1. You can ask your partner (partners are defined in the Rules) for advice about line. You cannot ask a competitor.

2. It doesn't matter what the format is, once the definition of a partner is satisfied.

3. Correct. Your caddie or partner can show you the line of play before your stroke but cannot provide you a target or alignment aid while you are making the stroke.