You are the network administrator for your company. The network consists of a single Active Directory domain. The Active Directory domain contains two domain controllers named DC1 and DC2. During routine monitoring of the domain controllers, you observe numerous errors in the system log. The errors are similar to the one shown in the following dialog box. You need to resolve these errors on your domain controllers as quickly as possible. What are two possible ways to achieve this goal? （）(Each correct answer presents a complete solution. Choose two.)