Find Sum of the Pair of Complex Numbers $5 + 4 \mathrm { i } , 6$

Multiple Choice

Find sum of the pair of complex numbers.
- $5 + 4 \mathrm { i } , 6$

A) $11 + 4 i$
B) $- 1 + 10 \mathrm { i }$
C) $- 1 + 4 \mathrm { i }$
D) $11 + 10 \mathrm { i }$