What is true about guards on interaction operands?
A) should not refer to any dynamic variables, i.e., to attributes of the lifelines
B) must only cover one lifeline, namely the one lifeline having the first event occurrence of the interaction operand
C) must always cover all lifelines covered by the operand
D) must cover the same lifelines on all interaction operands within one combined fragment

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The Answer of What is true about guards on interaction operands?
A) should not refer to any dynamic variables, i.e., to attributes of the lifelines
B) must only cover one lifeline, namely the one lifeline having the first event occurrence of the interaction operand
C) must always cover all lifelines covered by the operand
D) must cover the same lifelines on all interaction operands within one combined fragment

What Is True About Guards on Interaction Operands