Read the following statements related to the matrix analysis of structures and choose the correct option.
1. The flexibility matrix is a square matrix of order n, where n is the number of coordinates chosen for the solution of the problem at hand.
2. Due to the implementation of the Maxwell's reciprocal theorem, the flexibility matrix becomes a symmetrical matrix.
3. If the structure is unstable internally or externally, then the flexibility matrix will be a unit matrix for the given structure.
1
All statements are correct.
2
Statements 1 and 3 are correct, and statement 2 is incorrect.
3
Statements 1 and 2 are correct, and statement 3 is incorrect.
4
Statement 1 is correct, and statements 2 and 3 are incorrect.