When multiplying two arrays in Matlab using the rules of linear algebra the number of columns in the first array must equal the number of rows in the second array the number of rows in the first array...

• When multiplying two arrays in Matlab using the rules of linear algebra
  
  
  
  1. the number of columns in the first array must equal the number of rows in the second array
  
  
  2. the number of rows in the first array must equal the number of columns in the second array
  
  
  3. you need a period in front of the multiplication sign
  
  
  4. the arrays must have the exact same size and shape
  
  
  
  


• When combining two arrays in Matlab using the command A*B
  
  
  
  1. both arrays must be square
  
  
  2. the arrays must have the exact same size and shape
  
  
  3. the result is usually not the same as B*A
  
  
  4. all of the above
  
  
  
  

• When multiplying two vectors using the command A*B
  
  
  
  1. if A is a row vector then B must be a column vector
  
  
  2. A and B must both be row vectors
  
  
  3. A and B must both be column vectors
  
  
  
  

please help with these multiple choice question