Answer and Explanation:
The journal entries are as follows:
a. Bad debt $9,000
To account receivable $9,000
(Being the bad debt expense is recorded)
b. Account receivable Dr $9,000
To bad debt $9,000
(being the reversal is recorded)
c. Cash Dr $9,000
To account receivable $9,000
(Being the recovery of the bad debt is recorded)