Explanation:

- Section 100: This section does not relate to evidence; it deals with examinations and surveys in civil matters.

- Section 128: Deals with situations where privilege is not waived by volunteering evidence. It discusses conditions under which a witness can refuse to disclose privileged communication.

- Correct Answer: Section 128

- Section 123: Concerns privileged communication related to unpublished official records, not volunteering of evidence.

- Section 121: Pertains to judges and magistrates and their inability to be compelled to give evidence about their judicial opinions or proceedings.