Solution
$$7^{2} = 49$$ , $$17^{2} = 289$$ , $$5^{2}=25$$
$$\sqrt{(7)^{2}+(17)^{2}+(5)^{2}-2}$$= $$\sqrt{49+289+25-2}$$ = $$\sqrt{361}$$ =$$19$$
Hence Option D is the correct answer.
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