Which is true about the agile method?

a$.$ It is used when project teams want to use the predicative approach to a project.

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

c$.$ It uses several iterations or deliveries of software instead of waiting until the end of the project to provide a product.

d$.$ It is used when a project team wants to provide a potentially shippable product earlier rather than later.