Multiply, and Then Simplify If Possible $( \sqrt { 77 } - \sqrt { 847 } ) ( \sqrt { 11 } + \sqrt { 7 } )$

Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
- $( \sqrt { 77 } - \sqrt { 847 } ) ( \sqrt { 11 } + \sqrt { 7 } )$

A) $11 \sqrt { 7 } + 7 \sqrt { 11 } - 11 \sqrt { 77 } + 77$
B) $11 \sqrt { 7 } + 7 \sqrt { 11 } - 11 \sqrt { 77 } - 77$
C) $11 \sqrt { 7 } + 7 \sqrt { 11 } + 11 \sqrt { 77 } + 77$
D) $11 \sqrt { 7 } - 7 \sqrt { 11 } + 11 \sqrt { 77 } + 77$

Correct Answer:

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