Clause (b) of Section 9(1) of the Arms Act, 1959 prohibits which of the following acts?

Section 9(1)(b) regulates selling or transferring to a disqualified person and converting, repairing, testing or proving for that person. Its words "knows, or has reason to believe" impose the relevant awareness condition; acquisition, possession and carrying by the disqualified person are addressed in clause(a).