How many cores does the processor released in April 2012 with a price of $393 and part number av8063801117503 have?
CREATE TABLE "ivy_bridge_quad_core_22_nm" (
  "model_number" text,
  "s_spec_number" text,
  "cores" text,
  "frequency" text,
  "turbo" text,
  "l2_cache" text,
  "l3_cache" text,
  "gpu_model" text,
  "gpu_frequency" text,
  "socket" text,
  "i_o_bus" text,
  "release_date" text,
  "part_number_s" text,
  "release_price_usd" text
);
SELECT "cores" FROM "ivy_bridge_quad_core_22_nm" WHERE "release_date"='april 2012' AND "release_price_usd"='$393' AND "part_number_s"='av8063801117503';