This methodology uses story cards and code is released frequently, often twice a day or more. The work is integrated continuously throughout the project. Code is tested rigorously in this methodology and each test must pass with no errors. This also provides a significant amount of feedback to the team. This methodology also encourages teams to sit together in collocated workspaces. Which methodology does this describe and what technique is this question referring to$?$

Each correct answer represents a part of the solution. Choose all that apply.

A $$ Pair programming

B $$ XP

C $$ Test$-$first approach

D $$ Crystal

$$ Refactoring