FRANKFURT/SAN FRANCISCO (Reuters) – BMW (BMWG.DE) and Apple (AAPL.O) may rekindle a courtship put on hold after an exploratory visit by executives of the world’s top maker of electronic gadgets to the headquarters of the word’s biggest seller of premium cars. Apple Chief Executive Tim Cook went to BMW’s headquarters last year and senior Apple executives toured the carmaker’s Leipzig factory to learn how it manufactures the i3 electric car, two sources familiar with the talks told Reuters.