Marco and Gina were married in 1989. Ten years later, or in 1999, Gina left Marco and lived with another man, leaving their two children of school age with Marco. When Marco needed money for their children's education he sold a parcel of land registered in his name, without Gina's consent, which he purchased before his marriage. Is the sale by Marco valid, void or voidable? Explain with legal basis. (4%)