Which of the following statements best describes a shared characteristic of co-translational protein import into the ER and protein import into the mitochondrial matrix?a. Proteins to be imported are recognized by SRPb. Proteins to be imported are unfolded by a chaperone of the Hsp70 familyc. Proteins to be imported into both organelles have to be in an unfolded conformationd. Protein import depends on the activation state of a small GTPasee. Protein import depends on an ATPase that pulls the protein across the membrane