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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def remove(self, link_type, product, linked_product, identifierType=None):
 """ Remove a product link :param link_type: type of link, one of 'cross_sell', 'up_sell', 'related' or 'grouped' :param product: ID or SKU of product :param linked_product: ID or SKU of linked product to unlink :param identifierType: Defines whether the product or SKU value is passed in the "product" parameter. :return: boolean """

        return bool(self.call('catalog_product_link.remove',
                [link_type, product, linked_product, identifierType]))