The combination is given by the number of types of ice cream flavors multiplied by the number of sauces and multiplied again by the number of toppings. This is: 4 * 2 * 2 = 16.
Below I will write the list of these combinations:
CHW
CHF
CBW
CBF
VHW
VHF
VBW
VBF
MHW
MHF
MBW
MBF
DHW
DHF
DBW
DBF