You have a Microsoft 365 sensitivity label that is published to all the users in...

Statement 1 - No. The sensitivity label includes content marking (watermark: INTERNAL), but it only applies to documents where the label is manually or automatically applied, not to all documents by default.

Statement 2 - No. The sensitivity label only specifies a watermark, not a header. If a header marking was configured, it would explicitly appear in the label settings.

Statement 3 - No. There is no indication that auto-labeling is configured to apply the label only to documents with the word "rebranding". Auto-labeling is an optional setting that needs explicit configuration.