Which of the following statements describes a difficulty presidents face in the policy implementation process? (a) members of the bureaucracy often lack the expertise to carry out the president’s preferred policies. (b) members of the president’s cabinet can be removed at any time by congress. (c) because of civil service laws, it is not easy for the president to remove professional bureaucrats when they disagree with the president’s agenda. (d) congress generally gives specific details about how the laws they pass will be executed by members of the professional bureaucracy.