Consider the two following statements $A$ and $B$,and identify the correct choice given in the answers: $(A)$ Duddell's thermo galvanometer is suitable to measure direct current only. $(B)$ Thermopile can measure temperature differences of the order of $10^{-3} {}^{\circ}C$.
- ABoth $A$ and $B$ are true
- BBoth $A$ and $B$ are false
- C$A$ is true but $B$ is false
- D$A$ is false but $B$ is true
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