When conducting an interview, asking "Anything else?, What do you mean?, Why do you feel that way?," etc, are all forms of:

When conducting an interview, asking "Anything else?, What do you mean?, Why do you feel that way?," etc, are all forms of:
1). Contingency questions
2). Response categories
3). Protocols
4). Probes

Answers 2

Probes seems correct.
Probes