The problem involves finding currents $,,$ and $,$ as well as $,$ using two different models:

$($a$)$ using the constant voltage drop model

$$

$($b$)$ using the constant voltage drop model

$$

$($c$)$ using the exponential diode model

$$

$$

Would you like me to start solving part $($a$),$ provide guidance on how to approach the problem, or analyze a specific section?