(1) A right of contribution exists between or among two or more persons who are jointly and severally liable upon the same indivisible claim for the same injury, death or harm, whether or not judgment has been recovered against all or any of them. It may be enforced either in the original action or by a separate action brought for that purpose. The basis for contribution among liable persons is the comparative fault of each such person. However, the court may determine that two or more persons are to be treated as a single person for purposes of contribution.
(2) Contribution is available to a person who enters into a settlement with a claimant only (a) if the liability of the person against whom contribution is sought has been extinguished by the settlement and (b) to the extent that the amount paid in settlement was reasonable at the time of the settlement.
(3) The common law right of indemnity between active and passive tort feasors is abolished: PROVIDED, That the common law right of indemnity between active and passive tort feasors is not abolished in those cases to which a right of contribution by virtue of RCW 4.22.920(2) does not apply.