The other three options provided are all correct.

A good counsellor understands the complexity of human diversity and sees value in understanding human nature as explained by different humanities and social science theories. Such a counsellor accepts that there is no one theoretical approach that sufficiently explains human behaviour. Instead, they strive to integrate all theoretical knowledge into one general theory of counselling that could be applied to a variety of human contexts.

A good counsellor is the one trained in one major theoretical tradition that they know very well and practice within the strict guidelines of the theory in which they were trained. Such counsellors are able to transfer knowledge from their theoretical approach to explain a variety of interpersonal contexts.

 A good counsellor is the one who reads a variety of theories and applies the principles of various theories to the kind of problems clients from different contexts present with. Such a counsellor would also strive to familiarise themselves with different cultures in the society in which they work.