Generally Speaking, What Is the Relationship Between Career Bureaucrats and Higher-Level

Generally speaking, what is the relationship between career bureaucrats and higher-level political appointees?

A) Higher level appointees exert full control over the actions of career bureaucrats.
B) Career bureaucrats exert full control over their agencies without regard to the commands of appointees.
C) Career bureaucrats and higher-level appointees can come into conflict over policy for an agency and both exert power.
D) Higher level appointees and career bureaucrats work together to ensure there can be no outside influence on an agency.