Which best describes one of the themes in the "Mending Wall" by Robert Frost?

The theme of this poem is that a respectful distance between neighbours is the recipe for harmonious relationships:

‘Good fences make good neighbors’.

The theme of this poem is a farmer’s pride in the wisdom passed down to him by his father:

‘He will not go behind his father's saying’.

The poet portrays an unusual and dour country character:

‘like an old-stone savage armed he moves in darkness’.

The theme of this poem is co-operation between neighbours:

‘I let my neighbour know beyond the hill’.