Many Proteins Incorporated into the Thylakoid Lumen Are Synthesized

Many proteins incorporated into the thylakoid lumen are synthesized

A) in the thylakoid lumen.
B) in the stroma and transported across the thylakoid membrane.
C) on the outer chloroplast membrane and transported across the thylakoid membrane by way of its hydrophobic signal sequence.
D) in the cytosol, imported into the stroma, and transported across the thylakoid membrane by way of a second signal sequence.