At the end of an iteration, the product owner rejects the work items developed and provides feedback. What should an agile team do to avoid this situation in the future?

A project manager is working on a project with three virtual teams. Team A is in a different time zone than teams B and C.
The project was going well, but recently team A has started feeling left out. Information reaches team A late or is sometimes missed, and teams B and C give preference to each other's problems over team A.
The project manager has already set project guidelines, but realizes they need to be improved.
Which two things should the project manager do to help the teams collaborate better? (Choose two)

A new project needs to be submitted for urgent funding approval. The project, which will use a new technology, is vital to the organization. The entire Scrum team has worked together for over 3 years on multiple projects and delivered the previous project under the approved budget.
Which estimation technique should the project manager implement in this context?

Which process involves developing an approximation of the monetary resources needed to complete project activities?

A project manager is leading a project that has been in execution for 1 year. An experienced team member is performing well, but often disagrees with the project manager and refuses to implement their decisions. Part of the team supports the team member's defiance, while the other team members do not.
What should the project manager do?