Case 6-1 Detective Collins Was Conducting an Investigation on an Individual Who

Case 6-1
Detective Collins was conducting an investigation on an individual who was suspected of being a drug dealer. Detective Collins and his team often used an informant who was able to provide specific information that the suspect often sold drugs out of his home. Previous information provided by this informant has proven to be reliable. Detective Collins also conducted surveillance on the suspect's home. Detective Collins saw many people walking up to the window located on the south side of the suspect's house. The individuals would walk up to the window and knock three times. Moments later an individual would open the window and hand something to the individual outside.
-What source of probable cause would be what the informant provided to Detective Collins?

A) personal observation
B) information
C) evidence
D) association