Two single runways may be arranged so as to have A. L-shape B. T-shape C. X-shape D. All the above

The correct answer is D. All the above.

Two single runways may be arranged so as to have:

• L-shape: The runways are arranged in an L-shape, with one runway perpendicular to the other. This type of arrangement is often used at small airports with limited space.
• T-shape: The runways are arranged in a T-shape, with one runway perpendicular to the other and a shorter runway connecting them. This type of arrangement is often used at larger airports with more space.
• X-shape: The runways are arranged in an X-shape, with two runways crossing each other. This type of arrangement is rare, but it is sometimes used at large airports with very limited space.

Each of these arrangements has its own advantages and disadvantages. The L-shape is the most common arrangement, as it is relatively simple to construct and can accommodate a variety of aircraft. The T-shape is more complex to construct, but it can accommodate more aircraft than the L-shape. The X-shape is the most complex to construct, but it can accommodate the most aircraft of any of the three arrangements.

The choice of runway arrangement depends on a number of factors, including the size of the airport, the type of aircraft that will be using the airport, and the available space.