Which of the following conditions must be met in order for a patient consent to be valid?
1. The patient must sign the consent form before receiving sedation
2. The physician named on the consent form must perform the procedure
3. Blank spaces on the form must be completed by the physician after patient signature
(A) 1 and 2 only
(B) 1 and 3 only
(C) 2 and 3 only
(D) 1, 2, and 3