Answer:
Header files serve two purposes. System header files declare the interfaces to parts of the operating system. You include them in your program to supply the definitions and declarations you need to invoke system calls and libraries.
Answer: C
Time shifting is when you move from one period in time to another.
Explanation:
Refactoring consists of improving the internal structure of an existing program's source code, while preserving its external behavior.
Answer:
rsort()
Explanation:
the sorting function is used to sort the elements in the array.
the sorting can be increasing or decreasing, depends on the function used.
let discuss the option:
a. sort()
this is the sorting function, it used to sort the array in ascending order.
b. arsort()
this is also sorting function, it used to sort the associated array in descending order according to the value.
d. asort()
this is also sorting function, it used to sort the associated array in ascending order according to the value.
c. rsort()
this is the sorting function, it used to sort the array in descending order.
Therefore, the correct answer is rsort().