Which expression is used to indicate you are calling instead of another person?

Anglès - Gestió de vendes i espais comercials

a: I’m calling on behalf of...
b: I’ll call you back later.
c: Can I help you?
d: What’s it about?

Resposta correcta: a

Explicació: The phrase 'I’m calling on behalf of...' clearly states that you're representing someone else during the call.

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