**Core Concept**
The HDCV (Human Diploid Cell Vaccine) schedule for rabies involves administering a series of injections to prevent the development of rabies after exposure. This schedule typically consists of a combination of intramuscular and intradermal injections.

**Why the Correct Answer is Right**
The HDCV schedule for rabies includes an initial dose on day 0, followed by doses on days 3, 7, 14, and 28. This schedule is based on the concept of building immunity over time, with each dose providing additional protection against the rabies virus. The HDCV vaccine stimulates the production of antibodies against the rabies virus, which are essential for neutralizing the virus and preventing its spread to the central nervous system.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the standard HDCV schedule for rabies.
**Option B:** This option is incorrect because it is not the correct sequence of doses for HDCV.
**Option C:** This option is incorrect because it does not account for the entire HDCV schedule.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the HDCV schedule for rabies may vary depending on the country and local guidelines. However, the standard schedule remains the same, with a focus on providing adequate immunity against the rabies virus.

**Correct Answer: D.**