Answer:
(a)The fact that it uses random variables
Step-by-step explanation:
Quantitative models can be regarded as a compact representations in which
single differential or difference equation may be used in describing performance of the system as regards large set of input functions as well as initial states.Quantitative data can be measured and also can be expressed using numbers and can also be counted. Quantitative methods is based on objective measurements as well as statistical and mathematical, it could be base on numerical analysis of data which is been collected through polls or surveys. It should be noted that one of the characteristics that implies that a quantitative model is probabilistic in nature is the fact that it uses random variables