poinis of the given differential equation. W61-27)x+ (t+ 3)x' - (t – 9)x = 0 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The singular points are all ts OB. The singular points are all te OC. The singular points are all ts and t= (Use a comma to separate answers as needed.) OD. The singular point(s) islare t= (Use a comma to separate answers as needed.) O E. The singular points are all te and t= (Use a comma to separate answers as needed.) O F. There are no singular points