Write a question about the following article.

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 .

Question:
What may have been true of them in the past ?
pick from the following. +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 .;