When Erica was employed as a factory worker at Unisex Sports Clothing Designers (Pty) Ltd (USCD), the parties entered into a contract of employment in terms of which Erica would be entitled to 20 working days annual leave (the minimum number of annual leave days, as provided for in terms of the Labour Act 11 of 2007). Approximately two years after Erica's appointment, she joined the Industrial \& Allied Union. The Union and the company then negotiated a collective agreement, which provides for 25 working days' annual leave. Answer the following questions by applying the common law and/or Labour Act 11 of 2007: 5.1 Define a collective agreement. (2 marks) 5.2 Explain whether Erica would be entitled to 20 or 25 working days' annual leave with a discussion on the guidelines on how to establish the terms and conditions of employment of an individual employee. (8 marks)