SQL Server 2012 :: CROSS APPLY Returning Records From Left Recordset Even When No Matching Record In Right One

Following is the query that I'm running:

create table a (id int, name varchar(10));
create table b(id int, sal int);
insert into a values(1,'John'),(1,'ken'),(2,'paul');
insert into b values(1,400),(1,500);

select *
from a
cross apply( select max(sal) as sal from b where b.id = a.id)b;

Below is the result for the same:

idname sal
1John500
1ken500
2paulNULL

Now I'm not sure why the record with ID 2 is coming using CROSS APPLY, shouldn't it be avoided in case of CROSS APPLY and only displayed when using OUTER APPLY.

One thing that I noticed was that if you remove the Aggregate function MAX then the record with ID 2 is not shown in the output. I'm running this query on SQL Server 2012.