The correct answer is option 3: Gopura. A gopura is actually a feature of South Indian temple architecture, not North Indian temple architecture.

Let`s dissect the other options to understand them better.

Option 1: Sikhara. A sikhara is a tower-like structure that is commonly seen in both North and South Indian temple architecture. It is placed on top of the garbha griha (sanctum sanctorum) and is usually pyramid or conical in shape. So, sikhara is a feature of North Indian temple architecture, contrary to what the question asked.

Option 2: Garbha Griha. The garbha griha, also known as the sanctum sanctorum, is the innermost and holiest part of a temple where the main deity is housed. It is considered the most sacred part of the temple and is common to both North and South Indian temple architecture.

Option 4: Pradakshina. Pradakshina is the ritual of circumambulating, or walking in a clockwise direction around the sanctum sanctorum. It is a common practice in Hindu temples, regardless of the regional architecture.

In conclusion, option 3, Gopura, is