Answer : C
a. TTL iii. Evaluation of "diode-transistor-logic"
b. ECL iv. High speed digital circuits
c. MOS i. High component density
d. CMOS ii. Low power consumption
Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses.
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of transistor used for amplifying or switching electronic signals.
In electronics, emitter-coupled logic (ECL) is a high-speed integrated circuit bipolar transistor logic family.
Complementary metal–oxide–semiconductor (CMOS) is a technology for constructing integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits.
Reference : Logic Family