MySQL enum equivalent in MSSQL 2000

What is the equivalent of this MySQL statement in MSSQL 2000?

create table customer
 (cust_id integer IDENTITY (1, 1) not null,
  fed_id varchar(12) not null,
  cust_type_cd enum('I','B') not null,
  address varchar(30),
  city varchar(20),
  state varchar(20),
  postal_code varchar(10),
  constraint pk_customer primary key (cust_id)
 );