Which of the Following Is True About the Stereochemistry of S_N1

Which of the following is true about the stereochemistry of S_N1 reaction?

A) retention of configuration at the electrophilic center
B) inversion of configuration at the electrophilic center
C) 50:50 mixture of retention and inversion of configuration at the electrophilic center
D) slightly more inversion than retention at the electrophilic center
E) slightly more retention than inversion at the electrophilic center