Which of the following indicates correct R (Gas constant) values in different units?

a) $1.987 \mathrm{cal}.{\mathrm{mole}}^{-1}{\mathrm{K}}^{-1}$

b) $8.314 \mathrm{J} {\mathrm{mole}}^{-1}{\mathrm{K}}^{-1}$

c) $0.082 \mathrm{lit}-\mathrm{atm} {\mathrm{mole}}^{-1}{\mathrm{K}}^{-1}$

d) $82.1 \mathrm{lit}.{\mathrm{mole}}^{-1}{\mathrm{K}}^{-1}$