Which of the following is NOT one of the four types of client resistance?

In the context of client resistance, the correct choice is discussing, as it is not typically classified as a type of resistance. Instead, discussing generally involves open communication and engagement with the therapist or counselor, which can be a productive aspect of the therapeutic process.

In contrast, ignoring, denying, and arguing are recognized forms of resistance that clients may exhibit when they feel uncomfortable or threatened by the information or challenges presented in therapy. Ignoring may involve the client failing to respond or engage with therapeutic topics, denying refers to outright rejection of issues or problems, and arguing can be characterized by a combative stance or challenge to the therapist's perspectives or recommendations. All these behaviors serve to protect the client from confronting difficult emotions or changes, making them key areas for therapists to observe and address throughout the treatment process.