Write the main thread of a C program that uses the pthread$\_$create system call to sort a given n$-$element array of randomly generated integers, where n is a positive integer. The number n will be provided in the command line. The array will be sorted by the child thread and the sorted array will be output by the parent thread. Have the parent thread invoke the thread$\_$join system call to wait forthe child thread to finish the sorting task. For the child thread, you are only required to write the entry function signature. State any assumptions made.