Find all specified roots.Seventh roots of 1.
A. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
B. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
, -1
C. 1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
D. -1, cis 
, cis 
, cis 
, cis 
, cis 
, cis 
Answer: C
Mathematics
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