Question: Jim Keller is a microprocessor engineer most well known for his work at AMD and Apple, he was involved in designing which 32-bit package on package (PoP) system-on-a-chip (SoC) designed by Apple Inc. and manufactured by Samsung?
{'answer': 'Apple A4', 'supporting_facts': [['Jim Keller (engineer)', 1], ['Apple A4', 0]]}