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A  fair coin is tossed 10 times. What is the probability that ONLY the first two tosses will yield heads.

(A) $\left(\dfrac{1}{2}\right)^{2}$

(B) $^{10}C_2\left(\dfrac{1}{2}\right)^{2}$

(C) $\left(\dfrac{1}{2}\right)^{10}$

(D) $^{10}C_2\left(\dfrac{1}{2}\right)^{10}$