Primary valency is satsified by

Given:

Primary valency is satisfied by

Explanation:

The ionizable valency is the major or predominant valency.

A metal always loses one electron, becoming positively charged, which can only be balanced by forming a connection with a negative ion. The main valency of a coordination complex is the number of negative ions required to balance the charge on the central metal ion.

 Hence, the correct answer is (A) only negative ligands