Except as provided in subsection (e) of this section and unless a license is renewed for a 2-year term as provided in this section, the license expires every other year on the anniversary of the date of issuance of the license. At least 1 month before a license expires, the Board shall mail or electronically transmit to the licensee: a renewal application form; and a notice that states: the date on which the current license expires; and the amount of the renewal fee as required under § 6.5–207 of this title. If an electronic transmission under paragraph (1) of this subsection is returned to the Board as undeliverable, the Board shall mail to the licensee, at the last known address of the licensee, the materials required under paragraph (1) of this subsection within 10 business days of the date the Board received the notice that the electronic transmission was undeliverable. The failure of a licensee to receive the notice as provided for in this subsection does not prevent the license from expiring as specified under subsection (a) of this section. Before a license expires, the licensee periodically may renew it for an additional 2-year term, if the licensee: otherwise is entitled to be licensed; pays to the Board the appropriate license renewal fee required under § 6.5-207 of this title; and submits to the Board a renewal application on the form that the Board provides. The Board shall renew the license of and issue a renewal certificate to each licensee who meets the requirements of this section. The Board shall include on each renewal certificate that the Board issues the date on which the current license expires. The Secretary may determine that licenses issued under this subtitle shall expire on a staggered basis.