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Which of the following Boolean Expressions correctly represents the relation between $\text{P, Q, R}$ and $\mathrm{M}_{1}$ ?

1. $\text{M}_{1} = \text{(P OR Q) XOR R}$
2. $\text{M}_{1} = \text{(P AND Q) XOR R}$
3. $\text{M}_{1} = \text{(P NOR Q) XOR R}$
4. $\text{M}_{1} = \text{(P XOR Q) XOR R}$