The angles of a triangle are in the ratio $3:4:5$. Their circular measures are —

• a$\dfrac{\pi}{4},\ \dfrac{\pi}{3},\ \dfrac{5\pi}{12}$
• b$\dfrac{\pi}{6},\ \dfrac{\pi}{4},\ \dfrac{\pi}{3}$
• c$\dfrac{\pi}{3},\ \dfrac{\pi}{4},\ \dfrac{\pi}{2}$
• d$\dfrac{\pi}{12},\ \dfrac{\pi}{6},\ \dfrac{\pi}{4}$