What role do interest groups play in oducating policymakers about political issues?

a$.$ Interest groups are never considered a valid source of information because they are so biased.

b$.$ They are an important source of political informution.

c$.$ Politicians are legally barred from receiving policy or political information directly from interest groups.

d$.$ They serve to overwhelm policymakers with too much information.

e$.$ They tend to confuse policymakers and often alienate them.