Protein sequence A shows a string of leucines (hydrophobic amino acids) at one end and a string of arginine (hydrophilic amino acids) at the opposite end, whereas protein sequence B contains purely hydrophilic amino acids. It is known that both proteins are membrane proteins. Which of the following statements best classifies Protein A and Protein B?
a. Protein A is a surface protein; Protein B is a transmembrane protein.
b. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein.
c. Protein A is a transmembrane protein; Protein B is also a transmembrane protein.
d. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein that can only be situated on the outer side of the membrane.
e. Protein A is a transmembrane protein; Protein B is a peripheral membrane protein that can only be situated on the inner side of the membrane.