Google's Chrome OS integrates with web servers using cloud computing and storage to run applications and to perform other functions.

The assurance of the integrity of the chain of custody is a critical part of setting up and executing the ____________________ process.

Fill in the blank(s) with the appropriate word(s).

Write a stub for the following function prototype:

``` double root( double a, double b, double c, int i); // Precondition: a != 0 and a, b, c are coefficients of // a quadratic equation a*x*x + b*x + c = 0 The value // of i is either +1 or -1 to choose which root. // Postcondition: return value, x, satisfies the // equation a*x*x + b*x + c = 0 ```