This diagram represents a Linux process and its stack memory layout. The process has two threads, Thread$1$ and Thread$2,$ each with its own stack, sharing the same address space. Thread $1$ is executing and performing a function call, pushing data onto its stack. Simultaneously, Thread $2$ is also executing and making its own function call, pushing data onto its stack threads are using the same function with different arguments.

What will happen if both threads modify a global variable within the function?

Pick ONE option

The global variable will be overwritten with the value from the thread that called the function last.

The global variable will be unaffected, as each thread has its own stack, isolating their modifications.

The final value will be unpredictable since the order of their executions cannot be determined.

The global variable will automatically be protected, and only one thread can modify it at a time.