Which are the two strengths of using an agile development methodology?

Universal Containers (UC) has been following the Waterfall methodology to deliver customer apps in Salesforce. As the business is growing at scale and with demand to incorporate features and functionality at faster pace, UC is finding the Waterfall approach is not an optimal process, and intends to transition towards an agile development methodology.

Which are the two strengths of using an agile development methodology? Choose 2
A . Careful documentation is done at each step of the process so a target body of knowledge is available for inspection.
B. There are many small releases of functional code, allowing stakeholders to see and touch the work in progress.
C. All elements of the build are fully understood before work begins, reducing risk of unpleasant surprises.
D. The project requirements in later phases are expected and accommodated by the process, by design.

Answer: B,D