The correct answer is option 'C', which states that the DIAC (Diode for Alternating Current) can be represented by two diodes in anti-parallel. Let's understand why this is the correct representation.

DIAC:
The DIAC is a two-terminal device that is used to trigger thyristors, such as SCRs (Silicon Controlled Rectifiers), in AC (Alternating Current) circuits. It is a bidirectional device, meaning it can conduct current in both directions.

Representation of DIAC:
The DIAC can be represented by two diodes in anti-parallel configuration. This means that two diodes are connected in opposite directions (anode of one diode connected to the cathode of the other diode) and they share a common terminal.

Explanation:
When the voltage across the DIAC is below its breakover voltage, it behaves as an open circuit and does not conduct any current. However, when the voltage exceeds the breakover voltage, the DIAC enters a low-resistance state and starts conducting current.

In the representation of the DIAC using two diodes in anti-parallel, when the applied voltage is below the breakover voltage, both diodes are reverse biased and do not conduct any current. This corresponds to the open circuit state of the DIAC.

When the applied voltage exceeds the breakover voltage, one diode becomes forward biased and starts conducting current. This diode allows the voltage across the other diode to increase rapidly until it also becomes forward biased, resulting in both diodes conducting. This corresponds to the low-resistance state of the DIAC.

This representation helps us understand the behavior of the DIAC in terms of the diodes' conduction characteristics. It simplifies the understanding of the DIAC's behavior in AC circuits and its ability to trigger SCRs.

In conclusion, the DIAC can be accurately represented by two diodes in anti-parallel configuration, allowing us to understand its conduction behavior and its role in triggering SCRs in AC circuits.