The 15 minute SPX chart looks remarkable. Wedge for (a) and now - perhaps - the same wedge developing for (c).
At some point if prices get too high, wave [iv] does not work as a count. Officially that mark is the breach of wave [i] price range of 1256 SPX. But in practice, prices should not get that high. However something in the mid-1230 range would be acceptable. Hence our count of Minute [iv] is intact.
Time is also a heavy consideration for any normal wave four. And time has now matured and developed nicely for [iv].
But even in the top alternate count of Minor 2 up, it still implies the same: prices will turn back down.