Question: $ sort - nu + 4 - 5 f . lst . What does this command do ? a . Sort f . lst on

$ sort -nu +4-5 f.lst. What does this command do?
a.
Sort f.lst on the fifth field, assuming it as a numerical field
b.
sort f.lst on a fifth field
c.
sort f.lst on the fifth field, eliminating duplicate lines
d.
sort f.lst on the fifth field, after removing leading blank spaces.

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