Which of the following class of prestressed concrete bridge attribute to allow flexural tensile stress without any visible cracking?

Which of the following class of prestressed concrete bridge attribute to allow flexural tensile stress without any visible cracking? Correct Answer Class-2

Stress Limitation as per BS 8110 (Part 1, clause 4.1.3.)

Class 1: No tensile stresses;

Class 2: Flexural tensile stresses, but no visible cracking;

Class 3: Flexural tensile stresses, but surface crack widths not exceeding a maximum value (0.1 mm for members in aggressive environments and 0.2 mm for all other members)

There is no existence of clause 4 as per the above Codal provisions.