What does tho Parity flag $($PE$)$ indicate in $86$ assembly?

Whether the result of an arithmetic or boolean operation is positive or negative.

Whether the result of an arithmetic or boolean operation is even or odd.

Whethor an even or odd number of $1$ bits occus in the least significant byte of the destination operand after an arithmetic or boolean operation.

Whether a carry$-$out occurred from the most significant bit of the destination operand during an arithmetic operation.