Bumblebee served under him . Bulkhead was in charge of all of Cybertron 's space bridges . And Ratchet was retired on some quiet planet with a pink and white femme that he 'd known from before . They were all gone .
What may have been true of them in the past ?
Pick the best answer from the following options:
- They had served on a quiet planet .
 - None of the above choices .
 - They had met once on a bridge .
 - They were closely connected with one another .


They were closely connected with one another .