The label (LBL) instruction:

A) is always logically true.
B) has the same address as the JMP instruction with which it is used.
C) is used to identify the ladder rung that is the target destination of the JMP instruction.
D) all of these.

The label (LBL) instruction is used in conjunction with the JMP (jump) instruction in ladder logic programming. It serves as a marker or identifier for a specific location in the program, allowing the JMP instruction to direct the program flow to that point. Therefore, all the statements given are correct: it is always logically true as it serves as a reference point rather than a condition; it has the same address as the JMP instruction in the sense that the JMP instruction targets the address marked by the LBL instruction; and it is used to identify the ladder rung that is the target destination of the JMP instruction, making it easier to navigate complex programs.