Which is a portfolio definition practice?

What is this the purpose of: To ensure the successful implementation of the planned change initiatives as agreed in the Portfolio Strategy and Delivery Plan?

Which describes a 'key to success' of the resource management practice?

Which is a role of portfolio management in relation to programme and project management?

Which are benefits of assessing the impact of portfolio management?
1. It can help demonstrate a compelling case for investment in
portfolio management
2. It helps in the on-going development of more effective portfolio
management practices
3. It enables more effective implementation of programmes and projects
via management of the project development pipeline, dependencies, and
constraints
4. The process of measurement can help ensure success - reflecting the
management expression, what gets measured gets done?