____________ provides appropriate timeline information for report submissions and guidance on how a report should be formatted.

DAFI 91-204, which focuses on Safety Investigations and Reports, is the correct answer because it outlines the necessary protocols and requirements for conducting safety investigations within the Air Force. This includes providing a clear timeline for report submissions, which is crucial for maintaining safety standards and ensuring accountability. Furthermore, DAFI 91-204 specifies guidance on the formatting of these reports, ensuring consistency and clarity in documentation across the organization.

In this context, the other options do not directly address the timeline information and formatting guidance specific to safety reports. For instance, DAFI 91-101 pertains to nuclear weapons and is more focused on security protocols than on report submission processes. The Unit Committed Munitions List (UCML) is a catalog of munitions and does not deal with report formatting or timelines. DAFMAN 91-221 relates to investigations but does not provide the same comprehensive framework strictly for safety investigations and reporting as DAFI 91-204 does. Therefore, DAFI 91-204 is specifically tailored to the needs of safety investigations, making it the most appropriate choice.