Both the 124 and 134 (and 204/214/224) all use diplexed connectors. So all 2x2 and 3x3 indoor AP models use all the connectors for both 2.4 and 5GHz. What is of importance to you (for DAS) is which antenna connector is the primary chain. In that case, from the AOS user guide, the AP-134's primary chain is ANT-0 (which is the far-left connector if the connectors are up/on top. See the AOS userguide, searching for 'single-chain' for images. And any unconnector RP-SMA connectors should be properly temrinated with a dummy load. Finally, if your DAS is single-chain, it's likely smart to provision the AP in single-chain mode as well, but you should still cap the ANT1/2 connectors anyway.
Hope that helps!