Which of the following atoms is the most electronegative?

An atom with high electronegativity has:

Assertion : Electron affinity refers to an isolated atom's attraction for an additional electron while electronegativity is the ability of an atom of an element to attract electrons towards itself in a shared pair of electrons.
Reason : Electron affinity is a relative number and electronegativity is experimentally measurable.

Fluorine is a better oxidising agent than $Br_{2}$. It is due to

Select the incorrect order$(s)$ of electronegativity of the element$(s)$:

Of the following elements,which one has the highest electronegativity?