Question $8$

Determine whether the given formula is a wff or not. If it is a wff$,$ indicate its main operator.

Psup$(QsupR)sup[(P*-R)Q]$

It's a wff$.$ The main operator is the first $v,$ reading left to right.

It's a wff$.$ The main operator is the $-=.$

It's a wff$.$ The main operator is the second $v,$ reading left to right.

It's a wff$.$ The main operator is the $*.$

Not a wff