Introduction:
A Schottky diode is a semiconductor device that is widely used in various electronic applications. It is a type of diode that has unique characteristics compared to regular PN-junction diodes. One of the key features of a Schottky diode is its fast switching speed and low forward voltage drop. In this response, we will discuss the given statement and explain why option 'B' is the correct answer.

Explanation:
No reverse recovery time:
- One of the distinct advantages of a Schottky diode is its absence of reverse recovery time. Reverse recovery time is the time required for a diode to switch from the conducting state to the non-conducting state when the polarity of the voltage applied across it is reversed.
- In regular PN-junction diodes, there is a certain amount of stored charge in the depletion region, which takes time to dissipate when the diode is reverse-biased. This stored charge causes a delay in switching from the conducting to non-conducting state.
- However, in a Schottky diode, the switching speed is much faster because it does not have a depletion region. Instead, it relies on the metal-semiconductor junction for its operation. As a result, there is no stored charge to dissipate, and the diode can quickly switch states without any delay. This absence of reverse recovery time makes Schottky diodes ideal for high-frequency applications and fast switching circuits.

Other characteristics:
- Current flow due to electrons: Unlike regular PN-junction diodes, a Schottky diode has a metal-semiconductor junction instead of a PN junction. This metal-semiconductor junction allows the flow of current due to the movement of electrons across the junction. Therefore, option 'a' is incorrect.
- Large amount of storage charges: Schottky diodes have a low capacitance due to the absence of a depletion region. This low capacitance results in a minimal amount of stored charge, which contributes to their fast switching speed. Therefore, option 'c' is incorrect.
- Zero cut-in voltage: The forward voltage drop of a Schottky diode is typically lower compared to regular PN-junction diodes. However, it is not zero. Schottky diodes have a forward voltage drop ranging from 0.15V to 0.45V, depending on the material used. Therefore, option 'd' is incorrect.

Conclusion:
In conclusion, a Schottky diode does not have a reverse recovery time, making it suitable for high-frequency applications and fast switching circuits. It offers several advantages over regular PN-junction diodes, such as fast switching speed and low forward voltage drop. However, it does not have current flow due to holes only, a large amount of storage charges, or a zero cut-in voltage.