Which of the following commands run only one test case , present in sample_module.py using unittest?

Question

Q. Which of the following commands run only one test case , present in sample_module.py using unittest?

a). python -m unittest

b). python -m unittest sample_module ---xxx

c). python -m unittest sample_module.TestCase1

d). python -m unittest sample_module.TestCase1.test_method1