In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: An excited Bart comes home from school and shows Homer and Marge his delayed entry program form. Link Information: he is voiced by Julie Kavner and first appeared on television in The Tracey Ullman Show short "Good Night" on April 19, 1987 Question: Who are the voice actors who play the roles of Homer and Marge?
Answer: Julie Kavner