How should you conclude a formal complaint letter if you don't know the recipient's name?

Anglès - Gestió de vendes i espais comercials

a: Yours sincerely.
b: Regards.
c: Yours faithfully.
d: Best wishes.

Resposta correcta: c

Explicació: In formal communication, especially when the recipient's name is unknown, you should sign off with 'Yours faithfully' to maintain professionalism.

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