Step 1: Understand the nature of the question.
The question asks for the full form of the acronym "NDRF". This is a knowledge-based question related to common governmental or organizational acronyms.
Step 2: Identify the correct full form.
NDRF stands for National Disaster Response Force. It is an Indian specialized force constituted for the purpose of specialist response to a threatening disaster situation or disaster for the purpose of saving lives and having the ability to perform first response in a disaster situation.
Step 3: Verify with the options. (1) National Disaster Response Force: This is the correct full form.
(2) National Democratic Representative Forum: Incorrect.
(3) New Democracy Reforms Formulation: Incorrect.
(4) Nation department of Rural Finance: Incorrect.