Please help me with following questions.

These are from Scale agile framework web site for Lean portfolio management competency. Please give explanation of the answer why and why other answers are not the choice. Thank you for your help

40 What two considerations heavily influence functionality released to customers across the portfolio? (Choose two.)

Value Stream mapping

Milestones

Program capacity

Release schedules

Market rhythms

What should you use to help identify different portfolios within a company?

A review of the organization chart - Possible

A review of the program charters for the prior fiscal year

A review of the project charters for the prior fiscal year

A review of the company's annual report

What is an advantage of funding by Value Stream?

It is easier to calculate resource utilization planning for a Program Increment

It is easier to track costs at the project level

It is easier to get budget approvals if a Feature takes longer than expected

It is easier to forecast expenses for a Program Increment - VC

50 How might an organization ensure compliance at scale?

Add compliance resources

Validate compliance on cadence

Perform yearly compliance audits

Implement compliance phase-gates

What are two potential challenges or risks to building a Lean Portfolio Management function? (Choose two.)

Leading indicators are influencing decisions

Phase-gate approval processes are in place

There is a focus on products and services instead of projects

Velocity is not normalized across teams and Agile Release Trains