Apple Inc. (AAPL) will add a gold color option for its full-size iPads in an effort to boost a category that’s posted declining shipments this year, according to people familiar with the plans. New versions of the company’s 9.7-inch iPads, anticipated to be unveiled this month, will include gold as a choice of color for the rear metal cover, adding to the silver and gray available for the lighter iPad Air, the people said, asking not to be identified ahead of an announcement. Teresa Brewer, a spokeswoman for Cupertino, California-based Apple, declined to comment.