Deller Company (Deller) produces a diverse product range which includes both simple and complex products in terms of production and support requirements. Deller allocates all indirect costs using total units produced as the allocation base in a single plant-wide overhead rate. Which of these statements are likely to be true? Note: multiple answers possible Both highly-complex and simple-to-produce products will tend to be costed reliably High volume simple-to-produce products will tend to be over-costed Low volume complex-to-produce products will tend to be under-costed High volume simple-to-produce products will tend to be under-costed Low volume complex-to-produce products will tend to be over-costed