Q1- Write a C++ code that utilizes the PTHREAD library to synchronize the action of a group of threads. Each one of these threads is responsible for printing one character of the string shown below. THIS IS A TEST You must use the following parameters: 1. Every thread is responsible for printing unique character. For example; thread is responsible for printing T character (3 times according to their occurrence in the string). 2- You must use the Semaphores only as synchronization elements. 3. You must use the PTHREAD library to implement the actions of threads creation, synchronization, sleeping, ... 4- After it finishes, your synchronized code must output the string shown above (using multiple pthreads)