Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE customers ( customer_id VARCHAR, customer_name VARCHAR )
TABLE: CREATE TABLE customers_policies ( customer_id VARCHAR, policy_id VARCHAR )
TABLE: CREATE TABLE available_policies ( policy_type_code VARCHAR, policy_id VARCHAR )

### Question ###
What are all the policy types of the customer named 'Dayana Robel'?

### Accurate SQL ###

SELECT DISTINCT t3.policy_type_code FROM customers AS t1 JOIN customers_policies AS t2 ON t1.customer_id = t2.customer_id JOIN available_policies AS t3 ON t2.policy_id = t3.policy_id WHERE t1.customer_name = "Dayana Robel"