What is the prerequisite age and driving experience required to apply for a professional driver's license (Class A1, A2, A3, A4, or A5) in Chile under Ley 18.290?

1. At least 16 years old with no prior license
2. At least 20 years old, holding a valid Class B license for at least 2 years, and possessing an approved graduation certificate from an accredited Professional Driving School (Escuela de Conductores Profesionales)
3. At least 18 years old with 6 months of Class B license
4. At least 30 years old with a university degree