1. Suppose you are reusing a use case C from the use case diagram of an old project into a new project. Such use case (which is detailed and broken down into multiple use cases) is used in the new use case diagram as is, with an <> relationship (more specifically, in the new diagram we have a use case D such that D extends C). Explain, according to definitions of Allen & Frost (black-box reuse) and of Jacobson et al. (white-box reuse), whether you are performing black-box or white-box reuse.