The question asks about the provisions related to nursing breaks under the Maternity Benefit Act, 1961. Let's analyze the requirements of this Act to determine the correct answer.

The Maternity Benefit Act, 1961, is a law that governs the employment of women in certain establishments for prescribed periods before and after childbirth. It also provides for maternity leave and nursing breaks. According to Section 11 of the Maternity Benefit Act, 1961, a woman who returns to work after her delivery is entitled to two nursing breaks in addition to the regular intervals for rest allowed to her during the course of her daily work.

Now, let's examine the options provided:

• Option 1: Two breaks in addition to the interval for rest allowed to her - This is correct based on the provisions mentioned in the Maternity Benefit Act, 1961.
• Option 2: Two breaks within the interval for rest allowed to her - Incorrect, as the law explicitly provides two nursing breaks in addition to the regular rest intervals.
• Option 3: Three breaks in addition to the interval for rest allowed to her - Incorrect according to the Act; it specifies two breaks, not three.
• Option 4: One break within the interval for rest allowed to her - Incorrect, the Act provides for two breaks, not one, and these are in addition to the normal rest intervals.

Conclusively, based on the provisions of the Maternity Benefit Act, 1961, the correct answer is: "Two breaks in addition to the interval for rest allowed to her."