Birth control measures are methods used to prevent pregnancy. They can be categorized into various types, including hormonal methods, barrier methods, permanent methods, and natural methods. Among the options given, all of them are considered birth control measures. Let's discuss each option in detail:

A. IUCD (Intrauterine Contraceptive Device):
- An IUCD is a small, T-shaped device that is inserted into the uterus by a healthcare provider.
- It works by preventing fertilization of the egg or implantation of a fertilized egg.
- It is a long-lasting contraceptive method, providing protection for several years.
- Copper IUCDs release copper ions, which are toxic to sperm and eggs, while hormonal IUCDs release progestin to prevent pregnancy.

B. Vasectomy:
- Vasectomy is a surgical procedure that involves cutting or blocking the vas deferens, the tubes that carry sperm from the testicles to the urethra.
- It is a permanent form of birth control for males and is considered highly effective.
- After vasectomy, sperm is no longer present in the semen, thus preventing pregnancy.

C. Tubectomy:
- Tubectomy, also known as female sterilization or tubal ligation, is a surgical procedure that involves blocking or sealing the fallopian tubes.
- It is a permanent form of birth control for females and is considered highly effective.
- Tubectomy prevents the sperm from reaching the egg, thus preventing fertilization.

D. Contraceptive Pills:
- Contraceptive pills, also known as birth control pills, are hormonal pills that are taken orally.
- They contain synthetic hormones (estrogen and/or progestin) that prevent ovulation, thicken cervical mucus to prevent sperm from reaching the egg, and thin the lining of the uterus to prevent implantation.
- They are a popular and reversible method of birth control.

Therefore, the correct answer is option D - all of these (A, B, and D) are birth control measures.