Inverting exchange rate bid-offer quotes

Hi,

Got a silly question but I just need something clarified – if you are given a CHF/USD bid-quote offer and you need to invert it to get the USD bid-quote;

• Is it as simple as 1/bid is the new bid, and 1/offer is the new offer

OR

• 1/bid is now the offer, and 1/offer is now the bid?

Thanks