Which of the following is the NIPP definition of Critical Infrastructure?

A$.$ Systems and assets, whether physical or virtual, so vital to the United States that the incapacity or destruction of such systems and assets would have a debilitating impact on security, national economic security, national public health or safety, or any combination of those matters.

B$.$ The basic facilities, services, and installations needed for the functioning of a community or society, such as transportation and communications systems, water and power lines, and public institutions including schools, post offices, and prisons.

C$.$ Essential services for effective function of a nation which are vital during emergency,natural disasters such as floods and eathquake,outbreak of virus or other diseases which may affect thousands of people or distrupt facilities without warning.

D$.$ Fundamental facilities and systems serving a country, city, or area, as transportation and communication systems, power plants, and schools.