No he did not that was a poor choice.
I may be wrong, BUT here is what i think
b) line graph
d) pie graph
While the reader of a pie chart can clearly see which categories dominate, it can be difficult to see categories that occupy only a small percentage of the chart. This problem becomes worse if there are many small categories in the chart. Labeling the categories can also be difficult.
inside a function or a block which is called local variables
I would say the primary Beni fit is more space for storage , but also it does effect the speed eventually. If your hard drive is almost full, everything will be slower
