California Code, Education Code - EDC § 48982

(a) The notice shall be signed by the parent or guardian and returned to the school. Signature of the notice is an acknowledgment by the parent or guardian that he or she has been informed of his or her rights but does not indicate that consent to participate in any particular program has either been given or withheld.

(b) If the notice is provided in electronic format pursuant to subdivision (b) of Section 48981, the parent or guardian shall submit to the school a signed acknowledgment of receipt of the notice.