A food processing company is going to export packaged cereal to South Africa and the EU$.$ The producer has met the packaging fill level requirements as well as package size and appearance specifications for the two trading regions. What other package specification does the company need to meet to export the cereal?

A$)$ Food safe double layer design

B$)$ Space$-$efficient package design

C$)$ Durability and strength of packaging material

D$)$ Environmentally responsible packaging materials