Which linguistic security feature is widely implemented by major e-commerce platforms to prevent account takeovers?

E-commerce platforms have become increasingly sophisticated in how they protect customer data and prevent fraud. One fascinating area of cybersecurity involves linguistic analysis technologies to detect potential threats. This poll tests your knowledge of how language processing systems are used in modern e-commerce security protocols.

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Typing cadence analysis (keystroke dynamics) that identifies unusual typing patterns compared to the account owner's established linguistic profile
Mandatory grammar checks that prevent transactions if the user makes more than three grammatical errors during checkout
Regional dialect verification that confirms users are typing in their registered hometown dialect
Vocabulary breadth testing that requires users to define randomly selected uncommon words before major purchases