A) implications
B) domains
C) protocols
D) databases
E) extensions
Correct Answer: D
Solution :
[e] .xls, .doc and .pptx are filename extensions for MS Excel, Word and Power point documents respectively. They extension is an identifier specified as a suffix to the name by syntax, often separated from the base filename (by , e.g. , a dot , a space) , that indicates, e.g. , the encoding (file format), the usage , of a computer file.
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