Step 1: Determine the tense expressed in the sentence. The sentence talks about an action that will take place in the future, without emphasizing duration, completion, or any special condition. Therefore, it refers to a simple future action.
Step 2: Recall the usage of future auxiliaries in English. In modern English, will is commonly used with all persons to form the simple future. However, shall with the first person is still considered grammatically correct, especially in formal or traditional usage.
Step 3: Since both will and shall can correctly express the simple future in this context, both constructions are acceptable. Hence, the correct answer is (D).