Step 1: Understanding the Concept:
Different types of filters have different features.
Vertical leaf filters and plate and frame filters have specific characteristics.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the features of filters.
Step 3: Detailed Explanation:
Statement I: In vertical leaf filters, cake is removed by back flushing - correct.
Statement II: Plate and frame filters are easy to dismantle and clean - correct.
Thus, both statements are correct.
Step 4: Final Answer:
Both Statement I and Statement II are correct.
Hence, the correct option is (A).