Problem: Peter Riordan filed a lawsuit against the Grandin Life Insurance Company. Through an act known as (an injunction / service of process), Mr. Riordan delivered a written notice to Grandin notifying the company of the lawsuit filed against it. With regard to the parties involved in this lawsuit, Mr. Riordan is the (plaintiff / defendant). an injunction / plaintiff an injunction / defendant service of process / plaintiff service of process / defendant