As Obligate Intracellular Parasites, Viruses Have Which of These Characteristics

As obligate intracellular parasites, viruses have which of these characteristics?

A) After entering a cell, they use their own protein- synthesizing machinery to make more viral proteins that are used to assemble more copies of themselves.
B) After entering a cell, they use the host cell's machinery to make more copies of themselves using host proteins.
C) After entering a cell, they manufacture their own ATP and carbon- containing compounds, like proteins and nucleic acids, in order to survive.