✓ Correct answer: C. 3 yearsA safeguarding certificate is valid for three years, after which the driver must undertake refresher training.
Why the other options are incorrect:
• 1 year: The certificate remains valid for longer than one year.
• 2 years: Validity extends beyond two years.
• 5 years: Five years exceeds the three-year validity period set by TfL.
• 10 years: A 10-year validity period is not recognised under TfL requirements.
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