Ligand that splits d orbitals the most (strongest field ligand, CN-)

The same question, asked 2 times: 20 Apr 2025 S2, 15 Apr 2026 S2. Every wording below, oldest first.

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Question 1
20 Apr 2025 S2
77 $Which from following is a strong field ligand?$
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Question 2
15 Apr 2026 S2
36 $Which of the following ligands splits d orbitals to maximum level?$
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