The cost study of the treatment of the eradication of Helicobacter Pylori made from the perspective of a health care system in which the patient pays a fix amount k for each visit, day of stay in the hospital, drug prescribed or laboratory test, the costs measurement should be done taking into account the following criteria: Select one: O a. The cost of drugs is equal to their price minus k times the number of prescribed units. O b. The cost of doctor visits is equal to the cost of all visits done minus k times the number of prescribed drugs. O c. The cost of drugs is k times the number of prescribed drugs. O d. The cost of drugs is equal to their price multiplied by the number of prescribed units