Step 1: Understanding the Concept:
The question is about identifying the most suitable type of garden for growing cacti and succulents. This requires knowledge of the growing conditions these plants need.
Step 2: Detailed Explanation:
Cacti and succulents are plants adapted to arid or dry conditions. They require excellent drainage and cannot tolerate waterlogged soil, which leads to root rot.
\[\begin{array}{rl} \bullet & \text{Water Garden and Bog Garden are characterized by excessive moisture and are completely unsuitable for these plants. } \\ \bullet & \text{Terrace Garden is a structural design and doesn't inherently define the soil or moisture conditions. } \\ \bullet & \text{Rock Garden (or rockery) is specifically designed to mimic a rocky or alpine environment. The use of rocks, gravel, and sandy soil provides the excellent drainage that cacti and succulents need to thrive. Therefore, a rock garden is the ideal environment for these types of plants. } \\ \end{array}\]
Step 3: Final Answer:
Cacti and Succulents are most suitable for a Rock Garden due to its excellent drainage properties.