)which is true about the agile method?

a. it is often used when a project team can express the scope early in the product life cycle.

b. it uses several iterations or deliveries of software instead of waiting until the end of the project to provide a product.

c. it is used when a project team wants to provide a potentially shippable product earlier rather than later.

d. it is used when project teams want to use the predicative approach to a project.