You are writing a legal memorandum and want to include the following list. Which numbering system would be your best option? The three requirements of standing are 1) injury in fact, 2) causation, and 3) redressability. The three requirements of standing are (1) injury in fact, (2) causation, and (3) redressability. The three requirements of standing are 1. injury in fact, 2. causation, and 3. redressability. The three requirements of standing. The three requirements of standing are 1). injury in fact, 2). causation, and 3). redressability. Which of the above is correct?