Each of the following sentences has been divided into five parts (a), (b), (c), (d), and (e). One of these parts may contain a grammatical or idiomatic error. Identify the part that contains the error. If there is no error, choose option (e). The proposal aims to enhance efficiency (a) by reducing redundancies (b) and optimizing resources (c) while ensuring that compliance requirements are fully met (d). No error (e)