All nate specialties are offered at two levels, a. journeyman and master. b. installation and service. c. apprentice and journeyman. d. heating and air conditioning.

D. heating and air conditioning.

Explanation:

NATE is a business that declares specialists in the heating system, ventilation, and air conditioning industry.

Ransomware when you are usually dealing with anything that says Ransom it deals with money. Like when you hold someone for ransom it means you are holding them for money. Ransomware blocks access to data unless the ransom is paid.