QUESTION 5. (10 points) Part a) Why does embedded programming use 'extensions' to C ? Part b) What is the downside of extensions regarding code portability? Part c) What is an intrinsic function? Part d) In MSP430, interrupts are enabled/disabled by writing to the bit called GIE in the status register (SR: R2). Why do we use functions like below? Can't we write the code directly in C? \[ \begin{array}{l} \text { _enable_interrupts (); } \\ \text { _disable_interrupts (); } \end{array} \]