Asp.net MVC5 with E.F returns IQueryable or IEnumrable?

Hi everyone please help me to understand about asp.net mvc5 with e.f 6 is used  IQueryable or IEnumrable by default? I want to work using IQueryable because it is best for underlying database. I am using LINQ to entity approach and var keyword for holding linq results. By default my model classes is of type public className {get; set} so here returns  IQueryable or IEnumrable?

kindly help me