The diagram shows two linear supply curves labelled ${S_1}$ and ${S_2}$, where ${S_2}$ is a ${45^ \circ }$ line.
Which statement about the price elasticity of supply is correct?

1 )
The price elasticity of supply is different at every point along both ${S_1}$ and ${S_2}$.
2 )
The price elasticity of supply of ${S_1}$ is elastic and ${S_2}$ is unit elastic.
3 )
The price elasticity of supply of ${S_1}$ is inelastic and ${S_2}$ is unit elastic.
The price elasticity of supply is unit elastic at every point along both ${S_1}$ and ${S_2}$.
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