n 13 value. isset(); function returns ad O a. None out of O b. Integer O c. Boolean n O d. String - 14 To get the number of elements in the array we use function. od out of a. count); O b. strtolower(); c. strtoupper() d. isset(); n 15 Given is a _____ example of creating array with values. $months = [1=>"Jan Feb Mar Apr"); ed out of O a. invalid O b. correct n O c. None O d. incorrect