Step 1: Understanding the coordination number.
Coordination number refers to the number of ligands directly bonded to the central metal ion in a complex.
Step 2: Explanation of the options.
- (1) 6, 4, 6: This is not correct, as the coordination number for [FeCl\(_4\)]\(^{-}\) is 4, not 6.
- (2) 6, 6, 4: This is correct. [Fe(CN)\(_6\)]\(^{4-}\) and [Fe(CN)\(_6\)]\(^{3-}\) both have coordination number 6, and [FeCl\(_4\)]\(^{-}\) has coordination number 4.
- (3) 6, 3, 3: This is incorrect for the given complexes.
- (4) 2, 3, 3: This is incorrect for all three complexes.
Step 3: Conclusion.
The correct answer is (2) 6, 6, 4.