What network has an aspect of 4:3 and a PSIP Short Name of qvc?
CREATE TABLE table_51512 (
    "Channel" real,
    "Video" text,
    "Aspect" text,
    "PSIP Short Name" text,
    "Network" text
)
SELECT "Network" FROM table_51512 WHERE "Aspect" = '4:3' AND "PSIP Short Name" = 'qvc'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What network has an aspect of 4:3 and a PSIP Short Name of qvc? ### Input: CREATE TABLE table_51512 (
    "Channel" real,
    "Video" text,
    "Aspect" text,
    "PSIP Short Name" text,
    "Network" text
) ### Response: SELECT "Network" FROM table_51512 WHERE "Aspect" = '4:3' AND "PSIP Short Name" = 'qvc'