How many 500-pound munitions can the triple bomb bar lift at one time?

The triple bomb bar is specifically designed to hold three 500-pound munitions simultaneously. This capability is a critical aspect of its design, allowing aircraft to maximize their payload efficiency. The triple bomb bar provides a sturdy and reliable way to suspend these munitions under an aircraft, ensuring stability during flight.

In the context of the question, the other options do not align with the intended use and capacity of the triple bomb bar. While the other combinations of munitions may exceed or not utilize the structure's limitations effectively, the design's intention is clear—each of the three slots is tailored to accommodate a 500-pound munition, making it possible to transport three at once. This not only enhances operational flexibility but also meets mission requirements efficiently.