Explain two methods which the operating system may use to maintain the security of data stored on disk

Ayear in the modern gregorian calendar consists of 365 days. in reality, the earth takes longer to rotate around the sun. to account for the difference in time, every 4 years, a leap year takes place. a leap year is when a year has 366 days: an extra day, february 29th. the requirements for a given year to be a leap year are: the year must be divisible by 4if the year is a century year (1700, 1800, the year must be evenly divisible by 400some example leap years are 1600, 1712, and 2016.write a program that takes in a year and determines whether that year is a leap year.ex: if the input is 1712, the output is: 1712 is a leap year.ex: if the input is 1913, the output is: 1913 is not a leap year.

The cm is responsible for overseeing the actions of the crisis management team and coordinating all crisis management efforts in cooperation with disaster recovery and/or business continuity planning, on an as-needed basis

Ryan is working on the layout of her web page. she needs to figure out where her header, navigation bar, text, and images should go. what technique can her?