What Is the Purpose of Adding the Cap and Tail

What is the purpose of adding the cap and tail to the mRNA prior to leaving the nucleus?

A) To prevent and/or delay the degradation of the mRNA by enzymes in the cytoplasm
B) To attract and attach the translation machinery to the mRNA
C) To prevent the ends from attaching to other mRNA and extending the transcript
D) To prevent complementary RNA from binding to the mRNA and forming double stranded RNA