You created two subclasses, namely, SingletonA and SingletonB, of the original Singleton class and then created a subclass of SingletonA, called SingletonA$1.$ You created instances a$,$ a$1,$ and b for subclasses SingletonA, SingletonA$1,$ and SingletonB respectively and attached a dynamic property, x$,$ with a value $100$ to a$.$ What will be the result of the following code?$>>>$ b$.$xThis type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.optionATraceback $($most recent call last$)$:File $"",$ line $1,$ in AttributeError: 'SingletonA$1\text{'}$ object has no attribute 'x'optionBTraceback $($most recent call last$)$:File $"",$ line $1,$ in AttributeError: 'SingletonB' object has no attribute 'x'optionC$100$optionDTraceback $($most recent call last$)$:File $"",$ line $1,$ in AttributeError: 'SingletonA' object has no attribute $\text{'}$x$\text{'}$