Please select the types of evidence that are used to demonstrate a causal relationship. 1. Concomitant variation 2. Data reliability 3. Time order of occurrence 4. Absence of other causal factors Only 1 O 1. 2, and 3 O 1 and 2 O 1. 2, 3 and 4 3 and 4 O 1, 3, and 4