Under the Transfer of Property Act, 1882, by which of the following means may transfer of an actionable…

Under section 130 of the Transfer of Property Act, 1882, the transfer of an actionable claim is effected only by the execution of an instrument in writing signed by the transferor or his duly authorised agent, and it is complete on execution; so the answer is "By an instrument in writing signed by transferor". An oral agreement is not enough, and neither registration nor attestation by two witnesses is required.