Ariana, Boris, Cecile, and Diego are students in the service club. Three of the four students will be chosen to attend a conference.

Which choice represents the sample space, S, for this event?

S = {ABC, ABD, ACD, BCD}
S = {ABC, BCA, CDA, DAC}
S = {ABC, ABD, BAC, BDA, ACD, ADC, BCD, BDC}
S = {ABC, ABD, ACD, BCA, BCD, BDC, CAB, CBD, DAC, DBC}