a multiple choice for C++, thanks

Ral is developing a new feature for a company's code base. After implementing the new feature according to the specification, they do the following: 1. Create a series of tests that validate the behavior of the new feature in isolation 2. Create a series of tests that ensure the new feature works correctly when used by other, pre-existing components 3. Run the tests that are already present to make sure all previous features continue to function properly Which of the following correctly identifies the different types of tests that Ral performs? Pick ONE option 1. Unit Testing 2. Integration Testing 3. Regression Testing 1. Integration Testing 2. Regression Testing 3. Unit Testing 1. Unit Testing 2. Regression Testing 3. Integration Testing 1. Regression Testing 2. Unit Testing 3. Integration Testing