Which of the following statements is true about the Hungarian Revolution? Select all that apply. (Pick AT LEAST two options can be more)

a. The revolution began because of deep-rooted resentment about issues such as religion, patriotism, and personal freedoms.

b. The revolution was a failure and Hungary remained under communist control.

c. After the revolution, Hungary became an independent country.

d. The United States came to the aid of the Hungarians.