Consider a software program that is artificially seeded with $$100$$ faults. While testing this program, $$159$$ faults are detected, out of which $$75$$ faults are from those artificially seeded faults. Assuming that both real and seeded faults are of same nature and have same distribution, the estimated number of undetected real faults is ____________.

Match the following:
$$1)$$ Waterfall model
$$2)$$ Evolutionary model
$$3)$$ Component-based software engineering
$$4)$$ Spiral development

$$a)$$ Specifications can be developed incrementally
$$b)$$ Requirements compromises are inevitable
$$c)$$ Explicit recognition of risk
$$d)$$ Inflexible partitioning of the project into

In the context of modular software design, which one of the following combinations is desirable?

Which one of the following is TRUE?