Traffic flow analysis is classified as which?

c. An active attack

d. A passive attack​

Explanation:

Traffic flow analysis is a cyber attack method of acquiring information by intercepting and examining messages so as to decode them by analysing patterns in the way the messages are communicated.

Traffic flow analysis can either be active or passive depending on if the attacker alters communication in the case of active analysis or simply extracts information in case of passive analysis.  

the answer is sorting tools