What is the simplified form of the following expression? Assume a greater-than-or-equal-to 0 and c greater-than-or-equal-to 0 14 (RootIndex 4 StartRoot a Superscript 5 Baseline b squared c Superscript 4 Baseline EndRoot) minus 7 a c (RootIndex 4 StartRoot a b squared EndRoot) 7 a c (RootIndex 4 StartRoot a b squared EndRoot) 7 (RootIndex 4 StartRoot a b squared EndRoot) Negative 7 (RootIndex 4 StartRoot a b squared EndRoot) Negative 7 a c (RootIndex 4 StartRoot a b squared EndRoot)