Which of the following types of processing is essential for businesses that require access to current data such as airlines, ticket agencies, and stock investment firms
a.
batch processing
b.
multiple unit processing
c.
business intelligence processing
d.
online transaction processing

The correct answer is d) Online transaction processing

Explanation:

Online transaction processing OTP allows processes in real-time the requirements and reacts immediately to the user's request.

For this situation, airlines, ticket agencies, and stock investment firms; are businesses that don´t work without the OTP, it's totally necessary for his function.