放送應用程式宣傳廣告時，應著重於哪兩個主要行銷目標？

For app promotion campaigns, the primary marketing objectives are to increase exposure and engagement. Increased exposure (visibility) helps potential users discover the app, while increased engagement ensures that users not only download the app but also actively use and interact with it. "Expanding global reach and increasing in-store sales" is incorrect because in-store sales are not a direct metric for app promotion. "Increasing engagement and website traffic" is partially correct, but website traffic is less critical than overall exposure for app discovery. "Increasing exposure and expanding global reach" is also partially correct, but engagement is a more fundamental objective than global reach, which is a broader strategic goal rather than a primary marketing objective for a single campaign.