The total numbers of Navy personnel N (in thousands) and Marines personnel M (in thousands) from 2000 through 2007 can be approximated by the models
?
and 
?
where t represents the year, with t = 0 corresponding to 2000.
?
Find and interpret 
.
?
A. 
, which represents the total number of Navy and Marines personnel combined.
B. 
, which represents the total number of Navy and Marines personnel combined.
C. 
, which represents the total number of Navy and Marines personnel combined.
D. 
, which represents the total number of Navy and Marines personnel combined.
E. 
, which represents the total number of Navy and Marines personnel combined.
Answer: D
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