$2\mathrm{.}1$ Describe in detail the generic framework $($activities$)$ for the software

development process $[10]$

$2\mathrm{.}2$ What is requirements engineering, and $($b$)$ Describe in detail the steps

$($stages$)$ that makeup requirements engineering $[10]$

$2\mathrm{.}3$ What is object$-$oriented programming $($OOP$)?$ Explain FOUR key principles of

OOP$[10]$