Step 1: Analyzing binary value of a (00100001)
The binary number 00100001 equals 33 in decimal.
Hence, a corresponds to i (128).
Step 2: Analyzing binary value of b (11100011)
The binary number 11100011 equals 227 in decimal.
Hence, b corresponds to ii (227).
Step 3: Analyzing binary value of c (11111111)
The binary number 11111111 equals 255 in decimal.
Hence, c corresponds to iv (255).
Step 4: Analyzing binary value of d (10000000)
The binary number 10000000 equals 128 in decimal.
Hence, d corresponds to iii (33).
Conclusion:
The correct match is:
a-i; b-ii; c-iv; d-iii
So, the correct answer is (3) a-i; b-ii; c-iv; d-iii.