[Solved] Which of the following cannot be found by queuing formulas? A)the average number of units waiting for service B)the average time a unit spends in the system C)the probability that the service system is idle D)the maximum time a unit is in the system Seven Components: Typically refers to the essential elements or parts that make up a whole; context needed for a specific definition. Visible Fibers: Fibrous materials or threads that can be seen with the naked eye, often referring to those found in textiles, paper, or other composite materials. Invisible Fibers: Microscopic or very fine fibers that are not visible to the naked eye, which can be natural or synthetic and have various applications, including in textiles and forensic science. Black (UV) Light: Ultraviolet light that is not visible to the human eye but can cause fluorescent materials to glow, often used for amusement or inspection.