Which of the following groups of codes represent all the invalid BCD codes?
A) 1010, 1011, 1100, 1101, 1110, 1111 B) 1001, 1010, 1011, 1100, 1101, 1110
C) 1000, 1001, 1010, 1011, 1100, 1110 D) 1000, 1001, 1010, 1011, 1100, 1101
A
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a. True b. False
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_____________ photoelectric sensors separate the transmitter and receiver into different units, placed opposite each other.
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