Yahoo Inc. said Monday that it would rename itself Altaba Inc. and Chief Executive Officer Marissa Mayer would step down from the board after the closing of its deal with Verizon Communications Inc. Yahoo has a deal to sell its core internet business, which includes its digital advertising, email and media assets, to Verizon for $4.83 billion. The terms of that deal could be amended — or the transaction may even be called off — after Yahoo last year disclosed two separate data breaches; one involving some 500 million customer accounts and the second involving over a billion. …