Which of the following statement(s) is/are correct?

The central metal in a complex possesses two types of valencies, primary or ionizable valency and secondary valency or non-ionizable valency.

While the primary valency of the metal is variable, the secondary valency has a fixed value. The primary valency refers to the oxidation state and the secondary valency to the coordination number of the metal.

The primary valency is satisfied by only negative ions whereas the secondary valency either by anions or neutral molecules or both.

The secondary valencies are directed in space towards fixed positions around the neutral atom.

Hence, options A, B and C are correct.