The two practices considered unethical from the options provided are:
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The manager for a mobile phone provider posts negative reviews of a competing service. - This practice is unethical as it involves damaging a competitor’s reputation for personal or business gain.
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An executive for a fast food chain posts a rave review of his company’s new sandwich. - This is also unethical because it presents a biased opinion that may mislead consumers, as the executive has a vested interest in promoting their company’s products.
The other two options do not clearly demonstrate an unethical practice.