How can this be accomplished?

A developer needs to provide a Visualforce page that lets users enter Product-specific details during a Sales cycle.

How can this be accomplished? (Choose 2)
A . Download a Managed Package from the AppExhange that provides a custom Visualforce page to modify.
B . Copy the standard page and then make a new Visualforce page for Product data entry.
C . Download an Unmanaged Package from the AppExchange that provides a custom Visualforce page to modify.
D . Create a new Visualforce page and an Apex controller to provide Product data entry.

Answer: C, D