Which option is considered to be at the lowest level of abstraction? A. Binary code
B. User interface
C. Calculations
D. Accessing memory

i do believe its (c); they are required to perform any summarization or redistribution tasks

explanation:

a) click on any cells in the range of data

b) click the data

c) click sort& filter group, click sort

d) select the column to sort by and then select a sort order

e) select the next column to sort by and select the sort order

f) click ok