Match the LIST-I with LIST-II.

	List – I		List – II
A.	FDM	I.	has four possible Minterms
B.	Digital Circuits	II.	Frequency Division Multiplexing
C.	A Two-Variable function	III.	Universal flip-flop
D.	J-K flip flop	IV.	Combinational or Sequential

Choose the correct answer from the options given below:

Correct option is B

A. FDM → II. Frequency Division Multiplexing
FDM stands for Frequency Division Multiplexing. In FDM, the available communication bandwidth is divided into multiple frequency bands, and different signals are transmitted simultaneously using different frequency ranges.
B. Digital Circuits → IV. Combinational or Sequential
Digital circuits are broadly classified into two major categories:
1. Combinational circuits – output depends only on the present inputs.
2. Sequential circuits – output depends on present inputs as well as previous states.
C. A Two-Variable Function → I. Has Four Possible Minterms
For a Boolean function with two variables, say A and B, the possible input combinations are:
​$$2^2=4$$​​
These correspond to four possible minterms:
​$$\bar A\bar B,\quad \bar AB,\quad A\bar B,\quad AB$$​​
Thus, a two-variable Boolean function has four possible minterms.
D. J-K Flip-Flop → III. Universal Flip-Flop
The J-K flip-flop is called a universal flip-flop because it can be configured to perform the functions of other basic flip-flops. Its characteristic behavior is:

Information Booster
1. FDM → Frequency Division Multiplexing.
2. In FDM, different signals occupy different frequency bands simultaneously.
3. Digital circuits are broadly combinational or sequential.
4. An n-variable Boolean function has:
​$$2^n$$​​
possible minterms.
5. Therefore, a 2-variable function has $$2^2=4$$​ minterms.
6. J-K flip-flop is known as a universal flip-flop because it can be used to realize other flip-flop operations.