Which of the following diodes is reverse biased?

Which of the following diode is reverse biased

Which of the following diodes is forward biases?

Which of the following diodes is forward biased ?

Which of the following is reverse biased diode?

Which of the following diodes is forward-biased ?

In which one of the following devices the reverse biased characteristics of a p-n junction diode are used?

In the following, which one of the diodes is reverse biased ?

In the following, which one of the diodes is reverse biased ?