Which keyword when applied on a method indicates that only one thread should execute the method at a time.

A. A lightweight process that runs independently within a program B. A data structure to store variables C. A type of loop D. A synchronization mechanism

A. Processor B. Executor C. Threadable D. Runnable

A. Reduced memory usage B. Simplicity of code C. Improved program performance by utilizing multiple CPUs or CPU cores D. Elimination of exceptions

A. Create an object of the Thread class B. Create a class that implements the Runnable interface and override the run() method C. Use the start() method of the main thread D. None of These