Which of the following regarding the IS-IS PSNP is FALSE?

PSNPs are used on point-to-point links to acknowledge the receipt of an LSP.

There are three types of PSNPs: Level 1, Level 2, and Level 1/2.

A PSNP lists some of the LSPs in the router's database.

PSNPs are used by an IS-IS router to request LSP information from a neighboring router.