Which of the following is true when you put an ice cube, initially at 0°C, in a drink?
a. The drink immediately cools down, and the ice cube melts and warms up.
b. The drink immediately cools down, and the ice cube melts but does not warm up.
c. The drink and ice cube maintain their temperature while the ice melts.
d. The drink immediately cools down, and the ice cube immediately warms up.