单项选择题

If the lengths of two of the sides of a triangle are 9 and 10, which of the following could be the length of the third side Ⅰ. 1 Ⅱ. 11 Ⅲ. 21

A. None
B. Ⅰ only
C. Ⅱ only
D. Ⅰ and Ⅱ only
E. Ⅰ, Ⅱ, and Ⅲ
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