Which statement is true?

Responses

|−2.1|=−2.1
| − 2.1 | = − 2.1

|2.1|=−2.1
| 2.1 | = − 2.1

|2.1|=−2.1
| 2.1 | = − 2.1

|−2.1|=|−2.1|