According to the text, which of the following statements is correct about Libras? A EF is not an integral part of the sign itself. The facial expre...

According to the text, which of the following statements is correct about Libras?
A EF is not an integral part of the sign itself.
The facial expression is a non-manual component in Libras.
There are signs that can only be understood by facial expression.
There are 20 facial configurations that make up the EF parameter.
true
true
true
true