3 Show variable declarations for each of the structure type pointer variables given below a) student (name, id, marks, next) b) head(data, next) c) super(back, data, next) d) start( row, col, data, right, down) e) root(left, info, right) Where name is string type id is int type marks is float type info is char type row, col, data are int type next represents address of next node back represents address of previous node right represents address of right node down represents address of down node left represents address of left node