What does it mean for a team to be a "cross-functional" Team?

What does it mean for a team to be a "cross-functional" Team?
A . The team should be able to collaborate with different departments.
B. Each of the team members should be a developer, tester and architect.
C. The team has all the expertise (not each person) required to transform a Product Backlog item in a potentially releasable increment.

Answer: C

Explanation:

Cross-functionality does not mean that every team member knows everything and can do everything, but together they should have the required skills to get the job done.