; (ii) the applicant only hires individuals 21 years of age or older as employees; (iii) the applicant will not allow any employee to handle firearms until the employee has successfully undergone a background check in accordance with section 923(g)(10); and (iv) secure gun storage or safety devices will be available at any place in which firearms are sold under the license to persons who are not licensees (subject to the exception that in any case in which a secure gun storage or safety device is temporarily unavailable because of theft, casualty loss, consumer sales, backorders from a manufacturer, or any other similar reason beyond the control of the licensee, the dealer shall not be considered to be in violation of the requirement under this subparagraph to make available such a device) and include with the certification— (I) a description of how the applicant will secure, in accordance with the regulations issued under section 926(d), the premises from which the applicant will conduct business under the license (including in the event of a natural disaster or other emergency)