Consider the following statements Automatic signalling system results in 1 greater...

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Consider the following statements:
Automatic signalling system results in
1. greater risk
2. higher efficiency
3. avoidance of block instruments
4. higher operating cost
Of these statements

A. I and 2 are correct

B. 3 and 4 are correct

C. 1 and 4 are correct

D. 2 and 3 are correct

Answer: Option D

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