Answer: The most logical channel of communication for Sergio to use to contact his supervisor would be a phone call or an instant messaging service. This is because phone calls and instant messaging allow for immediate, real-time communication. Sergio needs to reach his supervisor as soon as possible to make a decision about an important client and these two channels of communication allow for the fastest and most direct form of communication. Email or text message may take longer for the supervisor to receive and respond to, which would not be ideal for Sergio's situation.
Step-by-step explanation: