Questão 96559

Examine the sentences below, paying close attention to the semantic and syntactic role of 'either'.

I. The system offers three authentication methods: password, fingerprint, or facial recognition, but the security protocol only allows the user to enable either of them at a time.
II. If the prime minister cannot secure a vote of confidence, the opposition leader can't either, which will lead to a constitutional crisis.
III. The scholarship is open to students from either the Arts faculty or the Science faculty, provided they meet the GPA requirements.

Which of the sentences contain a grammatically or semantically inappropriate use of 'either'?