Based on the information provided above answer the following question:

The following five activities need to be completed in the development of an interactive website for children. Activity $1$ begins first and activity $2$ is dependent on its completion before it can begin. Activity $3$ is dependent on the completion of both activities $2$ and $1.$ Activity $4$ is not dependent on information from any other activities, but activity $5$ is reliant on the completion of activity $4.$

Build a dependency matrix to represent these five activities.

Note: Enter $"$X$"$ in the appropriate places.