Question 6The value of $\left(\dfrac1{16}\right)^{a^0}+\left(\dfrac1{16a}\right)^0$ ${}-64^{-\frac{1}{2}}-(-32)^{-\frac{4}{5}}$ is:$1\dfrac{13}{16}$$1\dfrac3{16}$$1$$\dfrac78$$\dfrac1{16}$