D Question 3 1 pts Researchers were interested in determining a new drug for reducing high blood pressure. They obtained a sample of volunteers for the study and randomly divided them into two groups, C and T. A single medical practitioner, Dr. Daring, agreed to help the researchers in this study following a protocol of three steps: 1. The blood pressure of each subject was measured by Dr. Daring; Il. The new drug was administered to subjects in group T and a placebo to subjects in group C. Ill. After a determined amount of time, Dr. Daring measured the blood pressure of all the subjects again and provided all this information to the researchers. Only the researchers knew if a subject received the new drug or a placebo, but neither the subjects nor Dr. Daring knew this information. After some data analysis, the researchers concluded that in fact, the new drug lowered high blood pressure in patients. Select all the statements that are correct. This is an observational study. This is a double-blind experiment. This is a randomized controlled experiment. This observational study is controlling for high vs low blood pressure subjects This is not a double-blind experiment because Dr. Daring was interacting with subjects in both groups