Answer: Application layer
Step-by-step explanation: Application layer is the level in the OSI model which carries out the function of the abstraction in the network.The abstraction works by maintaining the interface between application and network.
It helps in the transferring of the information and data as well using the protocols. So,if any time out message alert is received by clicking on the link then the server condition is usually busy and thus cannot respond. In this case application layer is responsible for the problem.