Correct Answer : Option (A) :   ECL

Explanation : ECL stands for Emitter Coupled Logic. It is the fastest of all the logic families because of its higher transmission rate.

In Emitter Coupled Logic,

    * The storage time is removed as the transistors are utilized in different amplifier mode and are never driven into saturation.
    * It is the fastest logic family and has the minimum propagation delay.

In CMOS logic,

    * Power dissipation is basically 10nw per gate, relying on the power supply voltage, output load etc.
    * The CMOS components are usually expensive, but CMOS technology is cost-efficient.
    * It has high input impedance.

In TTL,

    * Power dissipation is basically 10nw per gate.
    * Cost-efficient components.
    * The possibility of damage to the equipment is less from electrostatic charge as compared to CMOS.