What is a critical infrastructure?

Select one:

a$.$

The use of electronic communication pretending to be a trusted entity such as a bank to gain personal information such as passwords or credit card details.

b$.$

Intellectual property being leaked to sabotage or extort an organisation or individual.

c$.$

The infrastructure that includes technical, legal, socio$-$economic and global political elements.

d$.$

Those interconnected systems and networks, the destruction of which would have a serious impact on the health, safety, and security of citizens, governments or the economy.