Write a complete C++ if-else-if statement that assigns Platinum, Gold, or Silver to a string variable named level depending on the value in a double variable named gift. Platinum status is awarded for donations of $12,000 or more. Gold status is awarded for donations that are not more than or equal to $12,000 but are at least $7,000. Silver status is awarded for donations that are less than $7,000. You may assume that the variable named level has been declared as a string data type and that the variable named gift has been declared as a double data type and has been initialized to a value that is greater than zero.