A Scrum Team with all the skills necessary to deliver a usable Increment is

Across-functional Scrum Teamis one that has all the skills necessary to deliver ausable Incrementof the product. This ensures that the team is not dependent on external groups to complete their work, enabling them to deliver value independently.

According to the2020 Scrum Guide:

Scrum Teams are cross-functional and self-managing.

Cross-functionality means the team includes all the necessary skills (e.g., development, testing, design) to complete the work in a Sprint and deliver an Increment.

Why the other options are incorrect:

A. Divided into sub-teams:Scrum discourages dividing teams based on function. The team should be collaborative and cross-functional.

B. Distributed:While Scrum Teams can be distributed geographically, this term does not define their ability to deliver a usable Increment.

D. Difficult to manage:A cross-functional Scrum Team is self-managing and does not require external management.