[单项选择]

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
In security, an (1) is a form of possible loss or harm in a computing system; examples of exposures are unauthorized disclosure of data, modification of data, or (2) of legitimate access to computing. A vulnerability is a weakness in the security system that might be exploited to cause loss or harm. A human who exploits a vulnerability perpetrates an attack on the system. Threats to computing systems are circumstances that have the potential to cause loss or harm; human attacks are examples of threats, as are natural disasters, inadvertent human errors, and internal hardware or software (3) . Finally, a control is a protective measure an action, a device, a procedure, or a technique - that reduces a vulnerability. The major (4) of computing systems are hardware, software, and data. There are four kinds of threats to the securi
A. decline
B. rejection
C. refusal
D. denial

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