As he thought about the hieroglyphs in Thothmes' and Ramesses' names, Champollion realized their significance. It went far beyond the names themselves and gave him an insight into the entire system of hieroglyphic writing. For the names revealed that hieroglyphs were not simply representations of sounds. Nor did they have an exclusively symbolic meaning, as Thomas Young and other scholars had long believed. Instead, they were a combination of the two. —The Riddle of the Rosetta Stone,
James Cross Giblin

Which line from the passage shows the big-picture conclusion?

“hieroglyphs in Thothmes’ and Ramesses’ names”
“Nor did they have an exclusively symbolic meaning”
“they were a combination of the two”
“hieroglyphs were not simply representations of sounds”