What is the validity period (vigencia) of a professional Licencia Nacional de Conducir (classes C, D or E) for a driver aged 21 to 65 under the current national licensing framework?

1. 1 year for all professional drivers regardless of age
2. 5 years, reduced to 2 years for drivers aged 66 to 70 and to 1 year from age 71
3. 10 years
4. Lifetime, with no renewal requirement