The following statements describe different aspects of protein targeting to the mitochondria:

A. Proteins targeted to the mitochondria usually contain an N-terminal signal sequence.

B. Mitochondrial precursor proteins are imported into the mitochondria in a fully folded state.

C. The translocation of proteins into the mitochondrial matrix requires only outer membrane translocases 

D. ATP and a membrane potential across the inner mitochondrial membrane are required for complete protein import into the mitochondrial matrix.

Identify the option that contains all correct statements about mitochondrial protein targeting.