Which one of the following is a failure to a system?

Which one of the following is a failure to a system?

a) Boot crash
b) Read failure
c) Transaction failure
d) All of the mentioned

From the Sonali & Janata Bank Assistant Database Administrator September 2021 – Preliminary (AUST) exam, question 8 of 93.

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All questions in Sonali & Janata Bank Assistant Database Administrator September 2021 – Preliminary (AUST)