The diagram shows the structure of a monomer, 1-chloro-1-fluoroethene.

Which of these options represents the correct structure of a section of the addition polymer formed from this monomer?
−CHCl−CHF−CHCl−CHF−-\text{CHCl}-\text{CHF}-\text{CHCl}-\text{CHF}-−CHCl−CHF−CHCl−CHF−
=CH2−CClF=CH2−CClF==\text{CH}_2-\text{CClF}=\text{CH}_2-\text{CClF}==CH2−CClF=CH2−CClF=
−CH2−CH2−CH2−CH2−-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-−CH2−CH2−CH2−CH2−
−CH2−CClF−CH2−CClF−-\text{CH}_2-\text{CClF}-\text{CH}_2-\text{CClF}-−CH2−CClF−CH2−CClF−
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