**Core Concept**
The occlusal radiograph is a type of dental radiograph that provides a two-dimensional representation of the upper or lower jaw. It is particularly useful for locating impacted teeth, assessing the relationship between teeth and surrounding bone, and identifying pathological lesions in the jaw.

**Why the Correct Answer is Right**
The correct answer is located in the alveolar process, which is the thickened ridge of bone that contains the tooth sockets. The occlusal radiograph is ideal for visualizing the alveolar process and the surrounding bone, making it an essential tool for diagnosing and treating various dental and maxillofacial conditions. The radiograph can help identify the presence of impacted teeth, supernumerary teeth, or other abnormalities in the jaw.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the occlusal radiograph is not typically used to locate the nasal cavity or sinuses.
**Option B:** This option is incorrect because the occlusal radiograph is not typically used to locate the TMJ (temporomandibular joint).
**Option C:** This option is incorrect because the occlusal radiograph is not typically used to locate the parotid gland.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the occlusal radiograph is a valuable tool for diagnosing and treating dental and maxillofacial conditions, particularly those related to impacted teeth and abnormal jaw development.

**Correct Answer: D. The alveolar process.**