The project output contains milestones and deliverables. The deference between them

a. deliverable is a significant event in the project, but milestone is a unique, measurable, and verifiable work product.

b. milestone is a significant event in the project, but deliverable is a unique, measurable, and verifiable work product.

c. milestone and deliverable have the same meaning.

d. milestone and deliverable are not from project output.
b. milestone is a significant event in the project, but deliverable is a unique, measurable, and verifiable work product.