The complex number $$0 - 7i$$ is a _________ number.

Question Analysis
This problem assesses the ability to classify a complex number based on its real and imaginary parts.

Key Concept Explanation
A complex number is classified as a pure imaginary number if its real part is zero and its imaginary part is non-zero.

Step-by-step Solution
1. Identify the real part: The real part is 0.
2. Identify the imaginary part: The imaginary part is -7, which is non-zero.
3. C...