Analyze the relationship between 'circa' and 'company' within the context of the input sentence.
Options: founded by, legal form, original broadcaster, operator

"The home appliances market in Australia is circa $4.6 billion, larger than many of the other categories JB HI-FI operates in, and presents a significant opportunity for the company as it leverages the strength and trust in the JB HI-FI brand."
legal form