The best and most correct answer among the choices provided by the question is the second choice "It is rigid."
The plant cell wall is composed of cellulose. Cellulose is a structural carbohydrate and is considered a complex sugar because it is used in both protection and structure. The plant cell wall consists of three layers. Each layer has its own unique structure and function.
I hope my answer has come to your help. God bless and have a nice day ahead!