Which two statements are true concerning buffer states as shown in GV$BH.

A CR image may get served from one instance to another to satisfy a read request.

An xcur image is not downgraded to a SCUR image for shipping to another instance until commits occur for updated rows on the block.

An xcur image is not shipped to another instance until commits occur for updated rows on the block.

A Pi block image may exist for a specific database block in only one instance.

An xcur block image may exist for a specific database block in only one instance.