List of top Electrical Circuits Questions on Maximum Power Transfer Theorem

Which one of the following options is the Thevenin voltage (in volts) across the resistor \(R_{Load}\) in the circuit given below?

A two-port network has z-parameters \(z_{11}=z_{22}=10\ \Omega\), and \(z_{12}=z_{21}=5\ \Omega\).
The value of \(R_L\) such that maximum power is transferred to \(R_L\) is \(\_\_\_\_\_\_\_\_\) \(\Omega\).
Port 1 of the network is driven by a 5 V source in series with a 5 \(\Omega\) resistor, and the load \(R_L\) is connected across port 2, as shown in the figure.