On its December $31,2024$ balance sheet, Crane Company appropriately reported a $$10,000$ debit balance in its Fair Value Adjustment account. There was no change during $2025$ in the composition of Crane's portfolio of debt inyestments held as available$-$for$-$sale debt securities$.$ The following information pertains to that portfolio:

$\backslash$table$[[$Security$,$Cost,Fair value at $\frac{12}{31}\frac{?}{25}$