(D) $\pi$-acid ligands (also known as $\pi$-acceptor ligands) are those that possess empty $\pi^*$ antibonding orbitals capable of accepting electron

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(D) $\pi$-acid ligands (also known as $\pi$-acceptor ligands) are those that possess empty $\pi^*$ antibonding orbitals capable of accepting electron density from the metal $d$-orbitals. This process is known as back-bonding or synergic bonding. $CO$,$CN^{-}$,and $NO^{\oplus}$ all contain such empty orbitals and are classic examples of $\pi$-acid ligands.