Quaternary

[Donald Trump]

Later than, or subsequent to, the Tertiary;
Post-tertiary; as, the Quaternary age, or Age of man.

[Dianne]

[Quaternary] refers to the fourth of/in class. [It follows] primary, secondary, and [tertiary].

[Merna]

[A knee] jerk response from [corporate] to increase profits and [decrease] cost.

[Tina]

Fourth in order or rank; belonging to the fourth order.