What's inside the apartment: The apartment consists of a bedroom, kitchen, living room, and bathroom. 
In the bedroom, there is a cabinet and two desks. The cabinet contains a bag of chips, a condiment bottle, two books, and a water glass. 
The kitchen is equipped with two tables, eight cabinets, a stove, a dishwasher, a microwave, and a fridge. An apple and a bag of chips are placed on one of the kitchen tables. The first, second, third, fifth, sixth, and eighth cabinets, from left to right, are empty. The stove houses a plate and a cupcake, while the dishwasher contains a water glass. The microwave holds a condiment bottle. The fourth cabinet contains an apple, and the seventh cabinet stores a bottle of wine and an apple. The fridge is stocked with two plates and a salmon. 
The living room features a coffee table and a sofa. The coffee table is adorned with two dish bowls, a plate, and a bottle of wine. A cupcake, a wine glass, and a water glass are situated on the sofa. 
The bathroom is furnished with a cabinet, which is currently empty. 
Actions taken by Mark: Mark is initially in the bathroom. He then proceeds to the kitchen, where he sequentially approaches the second, seventh, fifth, and third kitchen cabinets, opening and closing each one in turn. Following this, he walks towards the dishwasher, opens it, and then closes it. He then moves to the fourth kitchen cabinet, opens and closes it, before finally walking towards the microwave. 
Question: If Mark has been trying to get a salmon, which one of the following statements is more likely to be true? (a) Mark thinks that the salmon is inside the fridge. (b) Mark thinks that the salmon is not inside the fridge. Please respond with either a or b.