Let \( f: N \rightarrow N \) be a function such that \( \mathrm{f}(\mathrm{m}+\mathrm{n})=\mathrm{f}(\mathrm{m})+\mathrm…

Let \( f: N \rightarrow N \) be a function such that \( \mathrm{f}(\mathrm{m}+\mathrm{n})=\mathrm{f}(\mathrm{m})+\mathrm{f}(\mathrm{n}) \) for every \( m, n \in N \). If \( \mathrm{f}(6)=18 \), then \( f(2) \cdot f(3) \) is equal to:

[JEE Main 2021, 31 Aug (Shift 2)]