Richbourg Inc.'s Marketable Securities footnote had the following line items:

Marketable Securities at Dec 31, 2012 Amortized Cost Fair Value

Total Trading Securities $900 $1,000

Total Available-for-Sale Securities $4,000 $3,500

Total Held-to-Maturity Securities $1,000 $1,200

Total $5,900 $5,700

What is the book value of Marketable Securities on Richbourg's Balance Sheet at December 31, 2012?

$5,500

$5,900

$6,100

$5,700

$5,800