The ten-thousands\textquotesingle digit plus the millions\textquotesingle~digit of $$1234567890$$ is $$6 + 4 = 10$$. 
What is the sum of the ten-thousands\textquotesingle{} digit and the millions\textquotesingle{} digit of $$1234567890$$? 
Options:
A: $$7$$ 
B: $$9$$ 
C: $$10$$ 
D: $$11$$ 