According to Max Weber, which of the following is true about bureaucracy?

a$.$ Bureaucracy leads to excessive centralization of power

b$.$ Bureaucracy is the most effective and rational form of organization.

c$.$ Bureaucracy is only sultable for small organizations.

d$.$ Bureaucracy is a flexible and adaptable organizational structure.

e$.$ Bureaucracy is inherently corrupt and unethical.

f$.$ Bureaucracy is inefficient and should be abolished.