The diagram below shows a river system consisting of $7$ segments, marked $\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S}, \mathrm{T}, \mathrm{U}$, and $\mathrm{V}$. It splits the land into $5$ zones, marked $Z1, Z2, Z3, Z4$, and $Z5$. We need to connect these zones using the least number of bridges. Out of the following options, which one is correct?
Note: The figure shown is representative.
- Bridges on $\mathrm{P}, \mathrm{Q}$, and $\mathrm{T}$
- Bridges on $\mathrm{P}, \mathrm{Q}, \mathrm{S}$, and $\mathrm{T}$
- Bridges on $\mathrm{Q}, \mathrm{R}, \mathrm{T}$, and $\mathrm{V}$
- Bridges on $\mathrm{P}, \mathrm{Q}, \mathrm{S}, \mathrm{U}$, and $\mathrm{V}$
