Answer:
D) By creating a new ad group for the sale.
A) By setting campaign start/end dates.
Explanation:
Swee Yin must first create a new ad group in order for their campaign and products to show up on search results whenever google user search any related item or topic. Since this campaign only last a limited time, Swee Yin must set when the campaign starts and when it should end. They could post there campaign ads in both google search network and google display.