What is the technique called that is used to preserve the nutritional value, color, and flavor of vegetables and leaves, and also reduces microbial...

What is the technique called that is used to preserve the nutritional value, color, and flavor of vegetables and leaves, and also reduces microbial load and enzymatic action that ripens and spoils food?

a) Congelamento.
b) Branqueamento.
c) Cozimento.
d) Desidratação.