Ill. Admin. Code tit. 11, § 1900.920
b) All responses shall be in writing. The response shall contain the following:
5) A verification of the licensee in the following form:
"The undersigned certifies that the statements set forth in this request are true and correct, except as to matters therein stated to be on information and belief and as to such matters the undersigned certifies as aforesaid that he or she verily believes the same to be true."; and
f) The licensee may submit a response by: