What two second$-$generation $(2$G$)$ digital standards handle voice calls?

A$.$ IS$-136$ TDMA and public switched telephone network $($PSTN$)$

B$.$ Global system for mobile communications $($GSM$)$ and code$-$division multiple access $($CDMA$)$

C$.$ IS$-136$ TDMA and advanced mobile phone service $($AMPS$)$

D$.$ Global system for mobile communications $($GSM$)$ and FM capture effect