Answer: brand extension
Step-by-step explanation: In simple words, brand extension refers to the process in which a producer use the brand name or trademark of a well known firm on some new product with the objective of increasing sales.
Usually, in such cases the firm giving their trade mark or brand name take share in profit in the form of royalty. Thus, in the given case the strategy used by Bic of introducing perfume with an existing brand name is an example of brand extension.