Considere a expressão matemática. Qual das alternativas apresenta o comando correto para a expressão?

3.5 + rac{1}{2} imes ext{exp}(2) + rac{(7.1 + 4.2^2)}{(1.1 + 0.25^3)} - ext{sqrt}igg(rac{1}{3}igg)

3.5 + rac{1}{2} imes ext{exp}(2) + rac{(7.1 + 4.2^2)}{(1.1 + 0.25^3)} - ext{nthroot}igg(rac{1}{2}, 3igg)

3.5 + rac{1}{2} imes ext{exp}(2) + 7.1 + rac{4.2^2}{1.1} + 0.25^3 - ext{sqrt}igg(rac{1}{3}igg)

3.5 + rac{1}{2} imes ext{exp}(2) + rac{(7.1 + 4.2^2)}{(1.1 - 0.25^3)} - rac{ ext{sqrt}(1)}{3}