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D stands for data. Basically registers are made out of flip-flops, Thus flip-flops store data,hence the name.
Thus (d) is correct.

(b) is the expression in Sum of product form. Sum of products means the expression should be a combination of products and its sum. In expression (b), AB and CD are products and they are combined with ‘+’ sign. Thus we call the expression as sum of products.

3 select lines are needed for 8 inputs. They include: 000,001,010,011,100,101,110,111.

The actual colour of a light emitting diode is determined by the wavelength of the light emitted, which in turn is determined by the actual semiconductor compound used in forming the pn junction during the manufacture.

Diagonals elements cannot be combined.

Need to be sent in serial. (a) is correct.

SOAs exhibits much stronger nonlinear distortions in the form of self-phase modulation and four wave mixing.

The equation to show the relation between resistance and illumination can be written as
R = A.E^a
where E ?llumination (lux)
R ?esistance (Ohms)
A,a ?onstants
The value of ??epends on the CdS used and on the manufacturing process. Values usually range between 0.7 and 0.9

The truth table for XNOR gate is:

Y= A”B” + AB
(b) is the correct option.

The truth table for half subtractor is:

B= A’B
D= A’B+AB’
Thus option (c) is correct.

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