question: What are the conditions for a pilot book Φ to be designed? option 1: All elements have unit magnitude, and all columns are mutually orthogonal option 2: All elements have unit magnitude, and all rows are mutually orthogonal option 3: All elements have unit magnitude, and all elements in each column are the same option 4: All elements have unit magnitude, and all elements in each row are the same option 5: All elements have unit magnitude 