Jennifer is bringing a claim in damages for personal injury against her former employer Ramjet Limited. Both parties are legally represented and their solicitors have complied with the personal injury protocol. Both firms of solicitors have letterheads with their office addresses, telephone numbers, DX, fax, and e-mail details. The Defendant's solicitors' last letter says 'We confirm that we have instructions to accept service of proceedings.'

Given these facts alone, which of the following methods can now be used for service of Jennifer's claim form? Give full reasons for your answer.

[A] DX

[B] Fax

[C] E-mail