Endophyte Translates to "Inside Plant" and Refers to Which of the Following

Endophyte translates to "inside plant" and refers to which of the following?

A) bacteria that live inside of plants and help protect plants from disease-causing organisms
B) fungi that live inside of plants and produce oxygen for the plant
C) bacteria that live inside of plants and produce carbon dioxide for the plant
D) fungi that live inside of plants and help protect plants from disease-causing organisms
E) protozoans that live within plant cells and kill invading microorganisms