An Issue Is Showing the Time Tracking Section as Follows

An issue is showing the Time Tracking section as follows: There is clearly an hour's difference between the Original and Remaining estimates. Identify two possible reasons Logged Time is showing as Not Specified. (Choose two.)

A) Time tracking was not enabled when the work was logged.
B) The remaining estimate was adjusted without logging any effort.
C) The hour's work was logged via a REST call by the user.
D) The work log would have exceeded the project's time allowance, so it cannot be counted.
E) The original estimate was increased.
F) You do not have view permission to see the logged work.