1. An insurer domiciled in a State bound by this Convention may be sued:

(a) in the courts of the State where he is domiciled; or

(b) in another State bound by this Convention, in the case of actions brought by the policyholder, the insured or a beneficiary, in the courts for the place where the plaintiff is domiciled; or

(c) if he is a co-insurer, in the courts of a State bound by this Convention in which proceedings are brought against the leading insurer.

2. An insurer who is not domiciled in a State bound by this Convention but has a branch, agency or other establishment in one of the States bound by this Convention shall, in disputes arising out of the operations of the branch, agency or establishment, be deemed to be domiciled in that State.