Which statement is true about Dorothy Vaughan? 1. She assigned mathematicians to various projects, but she did not personally tackle the work herself.
2. At first, she did not want the responsibility of being section head, but she soon realized that she could influence important decisions in all departments at NACA.
3. She was initially hired by NACA to work as a secretary, but she earned a degree in math and got promoted to the job of "computer."
4. As a section head, she not only stood up for the women of West Computing, but also spoke in favor of other computers who deserved promotions or raises.