What makes a connection a broadband connection?

A broadband connection is defined as one that has speeds of at least $100,000$ bps$.$

A broadband connection is defined as one that has speeds of at least $200,000$ bps$.$

A broadband connection is defined as one that has speeds of at least $256,000$ bps$.$

A broadband connection is defined as one that has speeds of at least $640kps.$