How many values for earpads correspond to the headphone class Prestige and a US MSRP of $79?
CREATE TABLE "current_line_of_headphones" (
  "headphone_model" text,
  "headphone_class" text,
  "driver_matched_d_b" text,
  "construction" text,
  "earpads" text,
  "termination" text,
  "us_msrp" text
);
SELECT COUNT("earpads") FROM "current_line_of_headphones" WHERE "headphone_class"='Prestige' AND "us_msrp"='$79';