You are the administrator of your company’s Azure subscription, and Azure Active Directory (Azure AD) tenant. Your company has an on-prem Active Directory. Your boss asks you to research, allowing the company users to access the Line-of-business (LOB) Software as a Service (SaaS) applications using Conditional Access rules. You need to make sure your tenant meets the pre-requisites for Conditional Access to SaaS apps. What is the lowest Azure subscription level required to enable Conditional Access to SaaS apps?