He visits his mother off and on. Here "off and on" means?

He visits his mother off and on. Here "off and on" means?

  1. a) Regularly
  2. b) Hourly
  3. c) Occasionally
  4. d) Consistently

From the BCIC Assistant Programer (CSE) 2022 – Written (BUET) exam, question 31 of 56.

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