When is data sharing agreement MOST likely to be needed?

When is data sharing agreement MOST likely to be needed?
A . When anonymized data is being shared.
B . When personal data is being shared between commercial organizations acting as joint data controllers.
C . When personal data is being proactively shared by a controller to support a police investigation.
D . When personal data is being shared with a public authority with powers to require the personal data to be disclosed.

Answer: B