'Concatenating columns and rows together

I have a table with aircraft's and customer options in it.

Cust  |  opt1  |  opt2  
------------------------
A     |   abc  |  def   
B     |        |  mno   
F     |        |  pqr   
A     |        |  ghi

I use

SELECT
Cust,
opt1 + opt2 as options         
FROM myDB where Len(opt1) >1 or Len(opt2) >1

Of course I get cust A twice in my result list

Cust  |  options  |
------------------------
A     |   abcdef  |    
A     |      ghi  |
B     |      mno  |
F     |      pqr  |

How can I condense this query further so that the result becomes:

 Cust |  options    |
------------------------
A     |   abcdefghi  |    
B     |      mno     |
F     |      pqr     |

Thanks! (Working on SQL server Express)

sql sql-server-express

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