And/or

Means “or”, because “or” includes “and”.

“And” is a logical operator which gives the value one if and only if all the operands are one, and otherwise has a value of zero.
“Or” is a logical operation which gives the value one if at least one operand has the value one, and otherwise gives a value of zero.

It's utterly defeatist drafting, because of the presence of that slash. That slash admits that the plain, punctuated words of the English language have defeated you.

Never speak of this again.