Given the following array:

my @students = (

{

rst_name => John,

last_name => Smith,

gpa => 4.0,

},

{

rst_name => Mary,

last_name => Doe,

gpa => 1.9,

},

{

rst_name => Aaron,

last_name => Johnson,

gpa => 2.9,

},

{

rst_name => Joe,

last_name => MacDonald,

gpa => 3.8,

},

);

Please write a Perl program which uses map to create a new array that looks like this:

my @names = (

John Smith,

Joe MacDonald,

);

The names are sorted by last name, descending, and exclude students whose gpa is lower than 3.0.