Which of the following statements about TDD, BDD and ATDD is true?

Refactoring is a practice that is an integral part of TDD and is applied both to tests and to code written to satisfy those tests

ATDD is a black-box test design technique that is applicable exclusively at acceptance test level

BDD is a developer practice where business stakeholders are not usually involved as the tests are directly written at unit/component test level

ATDD is the practice of running the automated acceptance tests as part of a continuous integration process