Maximize profit with bounded sell window

Given an array prices[0..n-1] of daily stock prices and an integer D ≥ 1, you may perform at most one transaction (buy then sell). The sell day j must satisfy i < j ≤ min(i + D, n − 1) for the chosen buy day i. Return the maximum profit and the pair (i, j) achieving it; if no positive profit exists, return 0 and indicate that no transaction should be made. Design an O(n) time, O( 1) extra space algorithm, and discuss how you would adapt it for streaming input and for very large D.