Windows 7 includes a firewall to protect again potential hacking

What is meant by the term usability?

A. how often a security solution or device must be updated and how long the updates take B. the amount or percentage of time a computer system is available for use C. the probability that a failed security solution or device can be restored to its normal operable state within a given timeframe using the prescribed practices and procedures D. making a security solution or device easier to use and matching the solution or device more closely to organizational needs and requirements

Convert 0x5AF3 to binary. Use Table 6-6.