Richeal was given a verbal warning for his poor behaviour towards customers. There were no extenuating circumstances for this behaviour, however, she continued to disrespect customers. As a result, he was given a letter of discipline. Four months later, after another incident, Richeal was suspended for $3$ days without pay. What is this an example of$?$

Question $17$ options:

Downward communication

Progressive discipline

Behavioural development strategy

Just cause termination