Which of the following statements is true?

A$.$ a candidate $4-$itemset $\{$B F K C$\}$ is valid when $\{$B F K$\},\{$F K C$\}$ and $\{$B K C$\}$ are frequent

B$.$ a candidate $4-$itemset $\{$B F K C$\}$ is frequent when $\{$B F K$\},\{$F K C$\}$ and $\{$B K C$\}$ are

frequent

C$.$ a frequent $4-$itemset $\{$B F K C$\}$ may generate $14$ associate rules

D$.$ None of the above