以下Python代码中，哪个选项可以正确地创建一个类和其实例？（ ）
class MyClass():
pass
my_instance = MyClass('ok')
class MyClass():
def __init__(self):
print('hello')
my_instance = MyClass()
class MyClass(): x = 10 my_instance = MyClass(x)
def MyClass():
print("This is a method")
my_instance = MyClass()