A$)$ A modern operating system provides many services that are helpful to the computer user.

List two services you feel are most useful to you. Briefly explain how you use these services.

B$)$ Which of the following memory management mechanisms may suffer from external fragmentation?

a$.$ Fixed$-$sized contiguous allocation

b$.$ Variable$-$sized contiguous allocation

c$.$ Paging

d$.$ Segmentation

C$)$ Assume segmentation is used for memory management here. According to the given segment table below, translate the logical address $<2,450>$ into a physical address.

Segment table

Segment Base Length

$0200600$

$1230020$

$290550$

$31300580$

$41900200$