Which statement is true regarding "Information Security" and "Information Assurance"?

a$.$ Both Information Security and Information Assurance focus solely on protecting information assets.

b$.$ Information Security primarily focuses on protecting information assets, while Information Assurance has a broader focus on overall information system reliability and trustworthiness.

c$.$ Information Security and Information Assurance are interchangeable terms with no distinction in their focus.

d$.$ Information Assurance primarily focuses on protecting information assets, while Information Security has a broader focus on overall information system reliability and trustworthiness.